[error] UPNP_E_SOCKET_BIND (-203)

Hello !

I get the following error whenever I launch (via SSH) gmediastreamer on my Raspberry Pi Zero 2 W, with a fresh install of the Raspbian OS (32-bit, Full).

ERROR [2024-03-09 11:10:09.336410 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (59s)

View full output

pi@raspberrypi:~ $ gmediarender -f "RPI" --logfile=stdout

INFO  [2024-03-09 11:10:08.242690 | main] gmediarender 0.1 log started [ gmediarender 0.1 (libupnp-1.8.4; glib-2.66.8; gstreamer-1.18.4) ]
INFO  [2024-03-09 11:10:08.242880 | output] Using output module: gst (GStreamer multimedia framework)
INFO  [2024-03-09 11:10:08.317679 | gstreamer] Buffering disabled (--gstout-buffer-duration)
INFO  [2024-03-09 11:10:08.318029 | gstreamer] Set mute to off
INFO  [2024-03-09 11:10:08.318181 | connmgr] Registering support for 'application/dash+xml'
INFO  [2024-03-09 11:10:08.318221 | connmgr] Registering support for 'application/gxf'
INFO  [2024-03-09 11:10:08.318249 | connmgr] Registering support for 'application/kate'
INFO  [2024-03-09 11:10:08.318276 | connmgr] Registering support for 'application/mxf'
INFO  [2024-03-09 11:10:08.318301 | connmgr] Registering support for 'application/ogg'
INFO  [2024-03-09 11:10:08.318327 | connmgr] Registering support for 'application/sdp'
INFO  [2024-03-09 11:10:08.318353 | connmgr] Registering support for 'application/ttml+xml'
INFO  [2024-03-09 11:10:08.318378 | connmgr] Registering support for 'application/vnd.ms-sstr+xml'
INFO  [2024-03-09 11:10:08.318404 | connmgr] Registering support for 'application/vnd.rn-realmedia'
INFO  [2024-03-09 11:10:08.318433 | connmgr] Registering support for 'application/x-3gp'
INFO  [2024-03-09 11:10:08.318458 | connmgr] Registering support for 'application/x-ape'
INFO  [2024-03-09 11:10:08.318483 | connmgr] Registering support for 'application/x-apetag'
INFO  [2024-03-09 11:10:08.318508 | connmgr] Registering support for 'application/x-ass'
INFO  [2024-03-09 11:10:08.318533 | connmgr] Registering support for 'application/x-bzip'
INFO  [2024-03-09 11:10:08.318558 | connmgr] Registering support for 'application/x-dtls'
INFO  [2024-03-09 11:10:08.318582 | connmgr] Registering support for 'application/x-gdp'
INFO  [2024-03-09 11:10:08.318607 | connmgr] Registering support for 'application/x-gst-av-avs'
INFO  [2024-03-09 11:10:08.318632 | connmgr] Registering support for 'application/x-gst-av-daud'
INFO  [2024-03-09 11:10:08.318658 | connmgr] Registering support for 'application/x-gst-av-dsf'
INFO  [2024-03-09 11:10:08.318682 | connmgr] Registering support for 'application/x-gst-av-ea'
INFO  [2024-03-09 11:10:08.318708 | connmgr] Registering support for 'application/x-gst-av-film_cpk'
INFO  [2024-03-09 11:10:08.318733 | connmgr] Registering support for 'application/x-gst-av-idcin'
INFO  [2024-03-09 11:10:08.318758 | connmgr] Registering support for 'application/x-gst-av-iff'
INFO  [2024-03-09 11:10:08.318782 | connmgr] Registering support for 'application/x-gst-av-ipmovie'
INFO  [2024-03-09 11:10:08.318807 | connmgr] Registering support for 'application/x-gst-av-mm'
INFO  [2024-03-09 11:10:08.318832 | connmgr] Registering support for 'application/x-gst-av-mmf'
INFO  [2024-03-09 11:10:08.318857 | connmgr] Registering support for 'application/x-gst-av-nut'
INFO  [2024-03-09 11:10:08.318882 | connmgr] Registering support for 'application/x-gst-av-nuv'
INFO  [2024-03-09 11:10:08.318907 | connmgr] Registering support for 'application/x-gst-av-psxstr'
INFO  [2024-03-09 11:10:08.318950 | connmgr] Registering support for 'application/x-gst-av-smk'
INFO  [2024-03-09 11:10:08.318977 | connmgr] Registering support for 'application/x-gst-av-sol'
INFO  [2024-03-09 11:10:08.319002 | connmgr] Registering support for 'application/x-gst-av-vmd'
INFO  [2024-03-09 11:10:08.319027 | connmgr] Registering support for 'application/x-gst-av-wc3movie'
INFO  [2024-03-09 11:10:08.319053 | connmgr] Registering support for 'application/x-gst-av-wsaud'
INFO  [2024-03-09 11:10:08.319078 | connmgr] Registering support for 'application/x-gst-av-wsvqa'
INFO  [2024-03-09 11:10:08.319103 | connmgr] Registering support for 'application/x-hls'
INFO  [2024-03-09 11:10:08.319128 | connmgr] Registering support for 'application/x-icy'
INFO  [2024-03-09 11:10:08.319152 | connmgr] Registering support for 'application/x-id3'
INFO  [2024-03-09 11:10:08.319177 | connmgr] Registering support for 'application/x-kate'
INFO  [2024-03-09 11:10:08.319201 | connmgr] Registering support for 'application/x-navi-animation'
INFO  [2024-03-09 11:10:08.319227 | connmgr] Registering support for 'application/x-ogg-avi'
INFO  [2024-03-09 11:10:08.319252 | connmgr] Registering support for 'application/x-ogm-audio'
INFO  [2024-03-09 11:10:08.319276 | connmgr] Registering support for 'application/x-ogm-text'
INFO  [2024-03-09 11:10:08.319301 | connmgr] Registering support for 'application/x-ogm-video'
INFO  [2024-03-09 11:10:08.319326 | connmgr] Registering support for 'application/x-pn-realaudio'
INFO  [2024-03-09 11:10:08.319351 | connmgr] Registering support for 'application/x-rdt'
INFO  [2024-03-09 11:10:08.319376 | connmgr] Registering support for 'application/x-rtcp'
INFO  [2024-03-09 11:10:08.319401 | connmgr] Registering support for 'application/x-rtcp-stream'
INFO  [2024-03-09 11:10:08.319426 | connmgr] Registering support for 'application/x-rtp'
INFO  [2024-03-09 11:10:08.319450 | connmgr] Registering support for 'application/x-rtp-stream'
INFO  [2024-03-09 11:10:08.319475 | connmgr] Registering support for 'application/x-sctp'
INFO  [2024-03-09 11:10:08.319499 | connmgr] Registering support for 'application/x-srtcp'
INFO  [2024-03-09 11:10:08.319523 | connmgr] Registering support for 'application/x-srtcp-stream'
INFO  [2024-03-09 11:10:08.319548 | connmgr] Registering support for 'application/x-srtp'
INFO  [2024-03-09 11:10:08.319573 | connmgr] Registering support for 'application/x-srtp-stream'
INFO  [2024-03-09 11:10:08.319598 | connmgr] Registering support for 'application/x-ssa'
INFO  [2024-03-09 11:10:08.319623 | connmgr] Registering support for 'application/x-subtitle'
INFO  [2024-03-09 11:10:08.319647 | connmgr] Registering support for 'application/x-subtitle-avi'
INFO  [2024-03-09 11:10:08.319687 | connmgr] Registering support for 'application/x-subtitle-dks'
INFO  [2024-03-09 11:10:08.319713 | connmgr] Registering support for 'application/x-subtitle-lrc'
INFO  [2024-03-09 11:10:08.319738 | connmgr] Registering support for 'application/x-subtitle-mpl2'
INFO  [2024-03-09 11:10:08.319763 | connmgr] Registering support for 'application/x-subtitle-qttext'
INFO  [2024-03-09 11:10:08.319788 | connmgr] Registering support for 'application/x-subtitle-sami'
INFO  [2024-03-09 11:10:08.319813 | connmgr] Registering support for 'application/x-subtitle-tmplayer'
INFO  [2024-03-09 11:10:08.319838 | connmgr] Registering support for 'application/x-subtitle-unknown'
INFO  [2024-03-09 11:10:08.319863 | connmgr] Registering support for 'application/x-subtitle-vtt'
INFO  [2024-03-09 11:10:08.319888 | connmgr] Registering support for 'application/x-teletext'
INFO  [2024-03-09 11:10:08.319913 | connmgr] Registering support for 'application/x-usf'
INFO  [2024-03-09 11:10:08.319938 | connmgr] Registering support for 'application/x-yuv4mpeg'
INFO  [2024-03-09 11:10:08.319962 | connmgr] Registering support for 'audio/*'
INFO  [2024-03-09 11:10:08.319987 | connmgr] Registering support for 'audio/AMR'
INFO  [2024-03-09 11:10:08.320011 | connmgr] Registering support for 'audio/AMR-WB'
INFO  [2024-03-09 11:10:08.320035 | connmgr] Registering support for 'audio/G722'
INFO  [2024-03-09 11:10:08.320059 | connmgr] Registering support for 'audio/G723'
INFO  [2024-03-09 11:10:08.320083 | connmgr] Registering support for 'audio/G729'
INFO  [2024-03-09 11:10:08.320107 | connmgr] Registering support for 'audio/L16;rate=44100;channels=2'
INFO  [2024-03-09 11:10:08.320132 | connmgr] Registering support for 'audio/ac3'
INFO  [2024-03-09 11:10:08.320156 | connmgr] Registering support for 'audio/aiff'
INFO  [2024-03-09 11:10:08.320180 | connmgr] Registering support for 'audio/alac'
INFO  [2024-03-09 11:10:08.320205 | connmgr] Registering support for 'audio/aptx'
INFO  [2024-03-09 11:10:08.320229 | connmgr] Registering support for 'audio/aptx-hd'
INFO  [2024-03-09 11:10:08.320254 | connmgr] Registering support for 'audio/m4a'
INFO  [2024-03-09 11:10:08.320278 | connmgr] Registering support for 'audio/midi'
INFO  [2024-03-09 11:10:08.320302 | connmgr] Registering support for 'audio/mp4'
INFO  [2024-03-09 11:10:08.320325 | connmgr] Registering support for 'audio/mpeg'
INFO  [2024-03-09 11:10:08.320350 | connmgr] Registering support for 'audio/ms-gsm'
INFO  [2024-03-09 11:10:08.320374 | connmgr] Registering support for 'audio/ogg'
INFO  [2024-03-09 11:10:08.320398 | connmgr] Registering support for 'audio/qcelp'
INFO  [2024-03-09 11:10:08.320422 | connmgr] Registering support for 'audio/riff-midi'
INFO  [2024-03-09 11:10:08.320446 | connmgr] Registering support for 'audio/webm'
INFO  [2024-03-09 11:10:08.320470 | connmgr] Registering support for 'audio/x-ac3'
INFO  [2024-03-09 11:10:08.320495 | connmgr] Registering support for 'audio/x-adpcm'
INFO  [2024-03-09 11:10:08.320519 | connmgr] Registering support for 'audio/x-aiff'
INFO  [2024-03-09 11:10:08.320543 | connmgr] Registering support for 'audio/x-alac'
INFO  [2024-03-09 11:10:08.320568 | connmgr] Registering support for 'audio/x-alaw'
INFO  [2024-03-09 11:10:08.320592 | connmgr] Registering support for 'audio/x-amr-nb-sh'
INFO  [2024-03-09 11:10:08.320616 | connmgr] Registering support for 'audio/x-amr-wb-sh'
INFO  [2024-03-09 11:10:08.320640 | connmgr] Registering support for 'audio/x-au'
INFO  [2024-03-09 11:10:08.320665 | connmgr] Registering support for 'audio/x-ay'
INFO  [2024-03-09 11:10:08.320689 | connmgr] Registering support for 'audio/x-bfstm'
INFO  [2024-03-09 11:10:08.320713 | connmgr] Registering support for 'audio/x-brstm'
INFO  [2024-03-09 11:10:08.320737 | connmgr] Registering support for 'audio/x-bv'
INFO  [2024-03-09 11:10:08.320761 | connmgr] Registering support for 'audio/x-celt'
INFO  [2024-03-09 11:10:08.320785 | connmgr] Registering support for 'audio/x-dpcm'
INFO  [2024-03-09 11:10:08.320809 | connmgr] Registering support for 'audio/x-dsd'
INFO  [2024-03-09 11:10:08.320833 | connmgr] Registering support for 'audio/x-dts'
INFO  [2024-03-09 11:10:08.320857 | connmgr] Registering support for 'audio/x-dv'
INFO  [2024-03-09 11:10:08.320882 | connmgr] Registering support for 'audio/x-eac3'
INFO  [2024-03-09 11:10:08.320906 | connmgr] Registering support for 'audio/x-ffmpeg-parsed-ape'
INFO  [2024-03-09 11:10:08.320931 | connmgr] Registering support for 'audio/x-ffmpeg-parsed-musepack'
INFO  [2024-03-09 11:10:08.320956 | connmgr] Registering support for 'audio/x-flac'
INFO  [2024-03-09 11:10:08.320981 | connmgr] Registering support for 'audio/x-gbs'
INFO  [2024-03-09 11:10:08.321006 | connmgr] Registering support for 'audio/x-gsm'
INFO  [2024-03-09 11:10:08.321029 | connmgr] Registering support for 'audio/x-gst-av-mp3adufloat'
INFO  [2024-03-09 11:10:08.321054 | connmgr] Registering support for 'audio/x-gst-av-mp3on4float'
INFO  [2024-03-09 11:10:08.321079 | connmgr] Registering support for 'audio/x-gst-av-vmdaudio'
INFO  [2024-03-09 11:10:08.321104 | connmgr] Registering support for 'audio/x-gst-av-ws_snd1'
INFO  [2024-03-09 11:10:08.321129 | connmgr] Registering support for 'audio/x-gym'
INFO  [2024-03-09 11:10:08.321153 | connmgr] Registering support for 'audio/x-hes'
INFO  [2024-03-09 11:10:08.321177 | connmgr] Registering support for 'audio/x-iLBC'
INFO  [2024-03-09 11:10:08.321201 | connmgr] Registering support for 'audio/x-imc'
INFO  [2024-03-09 11:10:08.321225 | connmgr] Registering support for 'audio/x-ircam'
INFO  [2024-03-09 11:10:08.321250 | connmgr] Registering support for 'audio/x-it'
INFO  [2024-03-09 11:10:08.321274 | connmgr] Registering support for 'audio/x-kss'
INFO  [2024-03-09 11:10:08.321298 | connmgr] Registering support for 'audio/x-lpcm'
INFO  [2024-03-09 11:10:08.321322 | connmgr] Registering support for 'audio/x-m4a'
INFO  [2024-03-09 11:10:08.321346 | connmgr] Registering support for 'audio/x-mace'
INFO  [2024-03-09 11:10:08.321370 | connmgr] Registering support for 'audio/x-matroska'
INFO  [2024-03-09 11:10:08.321430 | connmgr] Registering support for 'audio/x-midi-event'
INFO  [2024-03-09 11:10:08.321457 | connmgr] Registering support for 'audio/x-mlp'
INFO  [2024-03-09 11:10:08.321481 | connmgr] Registering support for 'audio/x-mod'
INFO  [2024-03-09 11:10:08.321505 | connmgr] Registering support for 'audio/x-mpeg'
INFO  [2024-03-09 11:10:08.321529 | connmgr] Registering support for 'audio/x-mulaw'
INFO  [2024-03-09 11:10:08.321554 | connmgr] Registering support for 'audio/x-musepack'
INFO  [2024-03-09 11:10:08.321578 | connmgr] Registering support for 'audio/x-nellymoser'
INFO  [2024-03-09 11:10:08.321603 | connmgr] Registering support for 'audio/x-nist'
INFO  [2024-03-09 11:10:08.321627 | connmgr] Registering support for 'audio/x-nsf'
INFO  [2024-03-09 11:10:08.321652 | connmgr] Registering support for 'audio/x-opus'
INFO  [2024-03-09 11:10:08.321676 | connmgr] Registering support for 'audio/x-paris'
INFO  [2024-03-09 11:10:08.321700 | connmgr] Registering support for 'audio/x-pn-realaudio'
INFO  [2024-03-09 11:10:08.321725 | connmgr] Registering support for 'audio/x-private-ts-lpcm'
INFO  [2024-03-09 11:10:08.321750 | connmgr] Registering support for 'audio/x-private1-ac3'
INFO  [2024-03-09 11:10:08.321774 | connmgr] Registering support for 'audio/x-private1-dts'
INFO  [2024-03-09 11:10:08.321799 | connmgr] Registering support for 'audio/x-private1-lpcm'
INFO  [2024-03-09 11:10:08.321823 | connmgr] Registering support for 'audio/x-private2-lpcm'
INFO  [2024-03-09 11:10:08.321848 | connmgr] Registering support for 'audio/x-qdm2'
INFO  [2024-03-09 11:10:08.321872 | connmgr] Registering support for 'audio/x-raw'
INFO  [2024-03-09 11:10:08.321896 | connmgr] Registering support for 'audio/x-rf64'
INFO  [2024-03-09 11:10:08.321921 | connmgr] Registering support for 'audio/x-s3m'
INFO  [2024-03-09 11:10:08.321945 | connmgr] Registering support for 'audio/x-sap'
INFO  [2024-03-09 11:10:08.321969 | connmgr] Registering support for 'audio/x-sbc'
INFO  [2024-03-09 11:10:08.321993 | connmgr] Registering support for 'audio/x-scpls'
INFO  [2024-03-09 11:10:08.322017 | connmgr] Registering support for 'audio/x-sds'
INFO  [2024-03-09 11:10:08.322042 | connmgr] Registering support for 'audio/x-shorten'
INFO  [2024-03-09 11:10:08.322066 | connmgr] Registering support for 'audio/x-sid'
INFO  [2024-03-09 11:10:08.322090 | connmgr] Registering support for 'audio/x-sipro'
INFO  [2024-03-09 11:10:08.322115 | connmgr] Registering support for 'audio/x-siren'
INFO  [2024-03-09 11:10:08.322139 | connmgr] Registering support for 'audio/x-smpte-302m'
INFO  [2024-03-09 11:10:08.322164 | connmgr] Registering support for 'audio/x-spc'
INFO  [2024-03-09 11:10:08.322188 | connmgr] Registering support for 'audio/x-speex'
INFO  [2024-03-09 11:10:08.322212 | connmgr] Registering support for 'audio/x-stm'
INFO  [2024-03-09 11:10:08.322236 | connmgr] Registering support for 'audio/x-svx'
INFO  [2024-03-09 11:10:08.322261 | connmgr] Registering support for 'audio/x-true-hd'
INFO  [2024-03-09 11:10:08.322285 | connmgr] Registering support for 'audio/x-truespeech'
INFO  [2024-03-09 11:10:08.322309 | connmgr] Registering support for 'audio/x-tta'
INFO  [2024-03-09 11:10:08.322333 | connmgr] Registering support for 'audio/x-ttafile'
INFO  [2024-03-09 11:10:08.322358 | connmgr] Registering support for 'audio/x-twin-vq'
INFO  [2024-03-09 11:10:08.322382 | connmgr] Registering support for 'audio/x-unaligned-raw'
INFO  [2024-03-09 11:10:08.322407 | connmgr] Registering support for 'audio/x-vgm'
INFO  [2024-03-09 11:10:08.322431 | connmgr] Registering support for 'audio/x-vnd.sony.atrac1'
INFO  [2024-03-09 11:10:08.322456 | connmgr] Registering support for 'audio/x-vnd.sony.atrac3'
INFO  [2024-03-09 11:10:08.322481 | connmgr] Registering support for 'audio/x-voc'
INFO  [2024-03-09 11:10:08.322506 | connmgr] Registering support for 'audio/x-vorbis'
INFO  [2024-03-09 11:10:08.322530 | connmgr] Registering support for 'audio/x-voxware'
INFO  [2024-03-09 11:10:08.322554 | connmgr] Registering support for 'audio/x-w64'
INFO  [2024-03-09 11:10:08.322579 | connmgr] Registering support for 'audio/x-wav'
INFO  [2024-03-09 11:10:08.322603 | connmgr] Registering support for 'audio/x-wavpack'
INFO  [2024-03-09 11:10:08.322627 | connmgr] Registering support for 'audio/x-wavpack-correction'
INFO  [2024-03-09 11:10:08.322652 | connmgr] Registering support for 'audio/x-wma'
INFO  [2024-03-09 11:10:08.322676 | connmgr] Registering support for 'audio/x-wms'
INFO  [2024-03-09 11:10:08.322700 | connmgr] Registering support for 'audio/x-xi'
INFO  [2024-03-09 11:10:08.322724 | connmgr] Registering support for 'audio/x-xm'
INFO  [2024-03-09 11:10:08.322748 | connmgr] Registering support for 'closedcaption/x-cea-608'
INFO  [2024-03-09 11:10:08.322773 | connmgr] Registering support for 'closedcaption/x-cea-708'
INFO  [2024-03-09 11:10:08.322798 | connmgr] Registering support for 'image/bmp'
INFO  [2024-03-09 11:10:08.322822 | connmgr] Registering support for 'image/gif'
INFO  [2024-03-09 11:10:08.322846 | connmgr] Registering support for 'image/gst-libav-gif'
INFO  [2024-03-09 11:10:08.322870 | connmgr] Registering support for 'image/jp2'
INFO  [2024-03-09 11:10:08.322894 | connmgr] Registering support for 'image/jpeg'
INFO  [2024-03-09 11:10:08.322918 | connmgr] Registering support for 'image/pbm'
INFO  [2024-03-09 11:10:08.322942 | connmgr] Registering support for 'image/png'
INFO  [2024-03-09 11:10:08.322966 | connmgr] Registering support for 'image/ppm'
INFO  [2024-03-09 11:10:08.322990 | connmgr] Registering support for 'image/svg'
INFO  [2024-03-09 11:10:08.323014 | connmgr] Registering support for 'image/svg+xml'
INFO  [2024-03-09 11:10:08.323038 | connmgr] Registering support for 'image/tiff'
INFO  [2024-03-09 11:10:08.323062 | connmgr] Registering support for 'image/vnd.wap.wbmp'
INFO  [2024-03-09 11:10:08.323087 | connmgr] Registering support for 'image/webp'
INFO  [2024-03-09 11:10:08.323111 | connmgr] Registering support for 'image/x-MS-bmp'
INFO  [2024-03-09 11:10:08.323135 | connmgr] Registering support for 'image/x-bitmap'
INFO  [2024-03-09 11:10:08.323159 | connmgr] Registering support for 'image/x-bmp'
INFO  [2024-03-09 11:10:08.323183 | connmgr] Registering support for 'image/x-cmu-raster'
INFO  [2024-03-09 11:10:08.323207 | connmgr] Registering support for 'image/x-exr'
INFO  [2024-03-09 11:10:08.323231 | connmgr] Registering support for 'image/x-icon'
INFO  [2024-03-09 11:10:08.323255 | connmgr] Registering support for 'image/x-j2c'
INFO  [2024-03-09 11:10:08.323279 | connmgr] Registering support for 'image/x-jpc'
INFO  [2024-03-09 11:10:08.323303 | connmgr] Registering support for 'image/x-pcx'
INFO  [2024-03-09 11:10:08.323327 | connmgr] Registering support for 'image/x-pixmap'
INFO  [2024-03-09 11:10:08.323352 | connmgr] Registering support for 'image/x-portable-anymap'
INFO  [2024-03-09 11:10:08.323376 | connmgr] Registering support for 'image/x-portable-bitmap'
INFO  [2024-03-09 11:10:08.323401 | connmgr] Registering support for 'image/x-portable-graymap'
INFO  [2024-03-09 11:10:08.323426 | connmgr] Registering support for 'image/x-portable-pixmap'
INFO  [2024-03-09 11:10:08.323450 | connmgr] Registering support for 'image/x-sgi'
INFO  [2024-03-09 11:10:08.323521 | connmgr] Registering support for 'image/x-sun-raster'
INFO  [2024-03-09 11:10:08.323547 | connmgr] Registering support for 'image/x-tga'
INFO  [2024-03-09 11:10:08.323571 | connmgr] Registering support for 'meta/x-klv'
INFO  [2024-03-09 11:10:08.323596 | connmgr] Registering support for 'multipart/x-mixed-replace'
INFO  [2024-03-09 11:10:08.323620 | connmgr] Registering support for 'raw/x-pcap'
INFO  [2024-03-09 11:10:08.323645 | connmgr] Registering support for 'subpicture/x-dvb'
INFO  [2024-03-09 11:10:08.323669 | connmgr] Registering support for 'subpicture/x-dvd'
INFO  [2024-03-09 11:10:08.323693 | connmgr] Registering support for 'subpicture/x-pgs'
INFO  [2024-03-09 11:10:08.323717 | connmgr] Registering support for 'subtitle/x-kate'
INFO  [2024-03-09 11:10:08.323741 | connmgr] Registering support for 'text/plain'
INFO  [2024-03-09 11:10:08.323765 | connmgr] Registering support for 'text/x-cmml'
INFO  [2024-03-09 11:10:08.323789 | connmgr] Registering support for 'text/x-raw'
INFO  [2024-03-09 11:10:08.323813 | connmgr] Registering support for 'unknown/unknown'
INFO  [2024-03-09 11:10:08.323837 | connmgr] Registering support for 'video/mj2'
INFO  [2024-03-09 11:10:08.323861 | connmgr] Registering support for 'video/mpeg'
INFO  [2024-03-09 11:10:08.323885 | connmgr] Registering support for 'video/mpegts'
INFO  [2024-03-09 11:10:08.323909 | connmgr] Registering support for 'video/ogg'
INFO  [2024-03-09 11:10:08.323933 | connmgr] Registering support for 'video/quicktime'
INFO  [2024-03-09 11:10:08.323957 | connmgr] Registering support for 'video/sp5x'
INFO  [2024-03-09 11:10:08.323982 | connmgr] Registering support for 'video/webm'
INFO  [2024-03-09 11:10:08.324006 | connmgr] Registering support for 'video/x-4xm'
INFO  [2024-03-09 11:10:08.324031 | connmgr] Registering support for 'video/x-aasc'
INFO  [2024-03-09 11:10:08.324055 | connmgr] Registering support for 'video/x-amv'
INFO  [2024-03-09 11:10:08.324078 | connmgr] Registering support for 'video/x-apple-intermediate-codec'
INFO  [2024-03-09 11:10:08.324104 | connmgr] Registering support for 'video/x-apple-video'
INFO  [2024-03-09 11:10:08.324128 | connmgr] Registering support for 'video/x-asus'
INFO  [2024-03-09 11:10:08.324152 | connmgr] Registering support for 'video/x-ati-vcr'
INFO  [2024-03-09 11:10:08.324176 | connmgr] Registering support for 'video/x-av1'
INFO  [2024-03-09 11:10:08.324201 | connmgr] Registering support for 'video/x-bayer'
INFO  [2024-03-09 11:10:08.324225 | connmgr] Registering support for 'video/x-camstudio'
INFO  [2024-03-09 11:10:08.324256 | connmgr] Registering support for 'video/x-camtasia'
INFO  [2024-03-09 11:10:08.324281 | connmgr] Registering support for 'video/x-cavs'
INFO  [2024-03-09 11:10:08.324305 | connmgr] Registering support for 'video/x-cdxa'
INFO  [2024-03-09 11:10:08.324329 | connmgr] Registering support for 'video/x-cineform'
INFO  [2024-03-09 11:10:08.324354 | connmgr] Registering support for 'video/x-cinepak'
INFO  [2024-03-09 11:10:08.324378 | connmgr] Registering support for 'video/x-cirrus-logic-accupak'
INFO  [2024-03-09 11:10:08.324403 | connmgr] Registering support for 'video/x-compressed-yuv'
INFO  [2024-03-09 11:10:08.324428 | connmgr] Registering support for 'video/x-daala'
INFO  [2024-03-09 11:10:08.324452 | connmgr] Registering support for 'video/x-dirac'
INFO  [2024-03-09 11:10:08.324476 | connmgr] Registering support for 'video/x-divx'
INFO  [2024-03-09 11:10:08.324500 | connmgr] Registering support for 'video/x-dnxhd'
INFO  [2024-03-09 11:10:08.324525 | connmgr] Registering support for 'video/x-dv'
INFO  [2024-03-09 11:10:08.324549 | connmgr] Registering support for 'video/x-ffv'
INFO  [2024-03-09 11:10:08.324572 | connmgr] Registering support for 'video/x-flash-screen'
INFO  [2024-03-09 11:10:08.324597 | connmgr] Registering support for 'video/x-flash-screen2'
INFO  [2024-03-09 11:10:08.324621 | connmgr] Registering support for 'video/x-flash-video'
INFO  [2024-03-09 11:10:08.324646 | connmgr] Registering support for 'video/x-fli'
INFO  [2024-03-09 11:10:08.324669 | connmgr] Registering support for 'video/x-flv'
INFO  [2024-03-09 11:10:08.324694 | connmgr] Registering support for 'video/x-fraps'
INFO  [2024-03-09 11:10:08.324718 | connmgr] Registering support for 'video/x-fwht'
INFO  [2024-03-09 11:10:08.324742 | connmgr] Registering support for 'video/x-gst-av-8bps'
INFO  [2024-03-09 11:10:08.324766 | connmgr] Registering support for 'video/x-gst-av-avs'
INFO  [2024-03-09 11:10:08.324790 | connmgr] Registering support for 'video/x-gst-av-ffvhuff'
INFO  [2024-03-09 11:10:08.324815 | connmgr] Registering support for 'video/x-gst-av-flic'
INFO  [2024-03-09 11:10:08.324839 | connmgr] Registering support for 'video/x-gst-av-idcinvideo'
INFO  [2024-03-09 11:10:08.324864 | connmgr] Registering support for 'video/x-gst-av-interplayvideo'
INFO  [2024-03-09 11:10:08.324889 | connmgr] Registering support for 'video/x-gst-av-mdec'
INFO  [2024-03-09 11:10:08.324914 | connmgr] Registering support for 'video/x-gst-av-mmvideo'
INFO  [2024-03-09 11:10:08.324939 | connmgr] Registering support for 'video/x-gst-av-pgmyuv'
INFO  [2024-03-09 11:10:08.325042 | connmgr] Registering support for 'video/x-gst-av-qpeg'
INFO  [2024-03-09 11:10:08.325070 | connmgr] Registering support for 'video/x-gst-av-roqvideo'
INFO  [2024-03-09 11:10:08.325095 | connmgr] Registering support for 'video/x-gst-av-vmdvideo'
INFO  [2024-03-09 11:10:08.325121 | connmgr] Registering support for 'video/x-gst-av-vqavideo'
INFO  [2024-03-09 11:10:08.325146 | connmgr] Registering support for 'video/x-gst-av-wnv1'
INFO  [2024-03-09 11:10:08.325171 | connmgr] Registering support for 'video/x-gst-av-xl'
INFO  [2024-03-09 11:10:08.325195 | connmgr] Registering support for 'video/x-h261'
INFO  [2024-03-09 11:10:08.325219 | connmgr] Registering support for 'video/x-h263'
INFO  [2024-03-09 11:10:08.325244 | connmgr] Registering support for 'video/x-h264'
INFO  [2024-03-09 11:10:08.325268 | connmgr] Registering support for 'video/x-h265'
INFO  [2024-03-09 11:10:08.325292 | connmgr] Registering support for 'video/x-huffyuv'
INFO  [2024-03-09 11:10:08.325316 | connmgr] Registering support for 'video/x-indeo'
INFO  [2024-03-09 11:10:08.325340 | connmgr] Registering support for 'video/x-intel-h263'
INFO  [2024-03-09 11:10:08.325364 | connmgr] Registering support for 'video/x-ivf'
INFO  [2024-03-09 11:10:08.325388 | connmgr] Registering support for 'video/x-jpeg'
INFO  [2024-03-09 11:10:08.325412 | connmgr] Registering support for 'video/x-kmvc'
INFO  [2024-03-09 11:10:08.325436 | connmgr] Registering support for 'video/x-lagarith'
INFO  [2024-03-09 11:10:08.325460 | connmgr] Registering support for 'video/x-loco'
INFO  [2024-03-09 11:10:08.325485 | connmgr] Registering support for 'video/x-matroska'
INFO  [2024-03-09 11:10:08.325508 | connmgr] Registering support for 'video/x-matroska-3d'
INFO  [2024-03-09 11:10:08.325533 | connmgr] Registering support for 'video/x-mimic'
INFO  [2024-03-09 11:10:08.325557 | connmgr] Registering support for 'video/x-mjpeg-b'
INFO  [2024-03-09 11:10:08.325581 | connmgr] Registering support for 'video/x-mp4-part'
INFO  [2024-03-09 11:10:08.325610 | connmgr] Registering support for 'video/x-ms-asf'
INFO  [2024-03-09 11:10:08.325636 | connmgr] Registering support for 'video/x-msmpeg'
INFO  [2024-03-09 11:10:08.325660 | connmgr] Registering support for 'video/x-msvideo'
INFO  [2024-03-09 11:10:08.325685 | connmgr] Registering support for 'video/x-msvideocodec'
INFO  [2024-03-09 11:10:08.325710 | connmgr] Registering support for 'video/x-mszh'
INFO  [2024-03-09 11:10:08.325734 | connmgr] Registering support for 'video/x-nsv'
INFO  [2024-03-09 11:10:08.325758 | connmgr] Registering support for 'video/x-nuv'
INFO  [2024-03-09 11:10:08.325782 | connmgr] Registering support for 'video/x-pn-realvideo'
INFO  [2024-03-09 11:10:08.325807 | connmgr] Registering support for 'video/x-prores'
INFO  [2024-03-09 11:10:08.325831 | connmgr] Registering support for 'video/x-pva'
INFO  [2024-03-09 11:10:08.325855 | connmgr] Registering support for 'video/x-pwc1'
INFO  [2024-03-09 11:10:08.325879 | connmgr] Registering support for 'video/x-pwc2'
INFO  [2024-03-09 11:10:08.325903 | connmgr] Registering support for 'video/x-qdrw'
INFO  [2024-03-09 11:10:08.325927 | connmgr] Registering support for 'video/x-qt-part'
INFO  [2024-03-09 11:10:08.325951 | connmgr] Registering support for 'video/x-raw'
INFO  [2024-03-09 11:10:08.325975 | connmgr] Registering support for 'video/x-rle'
INFO  [2024-03-09 11:10:08.326000 | connmgr] Registering support for 'video/x-smc'
INFO  [2024-03-09 11:10:08.326024 | connmgr] Registering support for 'video/x-smoke'
INFO  [2024-03-09 11:10:08.326048 | connmgr] Registering support for 'video/x-sonix'
INFO  [2024-03-09 11:10:08.326072 | connmgr] Registering support for 'video/x-speedhq'
INFO  [2024-03-09 11:10:08.326096 | connmgr] Registering support for 'video/x-svq'
INFO  [2024-03-09 11:10:08.326120 | connmgr] Registering support for 'video/x-theora'
INFO  [2024-03-09 11:10:08.326144 | connmgr] Registering support for 'video/x-truemotion'
INFO  [2024-03-09 11:10:08.326168 | connmgr] Registering support for 'video/x-tscc'
INFO  [2024-03-09 11:10:08.326192 | connmgr] Registering support for 'video/x-ultimotion'
INFO  [2024-03-09 11:10:08.326216 | connmgr] Registering support for 'video/x-unaligned-raw'
INFO  [2024-03-09 11:10:08.326241 | connmgr] Registering support for 'video/x-vmnc'
INFO  [2024-03-09 11:10:08.326265 | connmgr] Registering support for 'video/x-vp3'
INFO  [2024-03-09 11:10:08.326289 | connmgr] Registering support for 'video/x-vp5'
INFO  [2024-03-09 11:10:08.326312 | connmgr] Registering support for 'video/x-vp6'
INFO  [2024-03-09 11:10:08.326336 | connmgr] Registering support for 'video/x-vp6-alpha'
INFO  [2024-03-09 11:10:08.326360 | connmgr] Registering support for 'video/x-vp6-flash'
INFO  [2024-03-09 11:10:08.326385 | connmgr] Registering support for 'video/x-vp8'
INFO  [2024-03-09 11:10:08.326409 | connmgr] Registering support for 'video/x-vp9'
INFO  [2024-03-09 11:10:08.326433 | connmgr] Registering support for 'video/x-wmv'
INFO  [2024-03-09 11:10:08.326457 | connmgr] Registering support for 'video/x-xan'
INFO  [2024-03-09 11:10:08.326481 | connmgr] Registering support for 'video/x-zmbv'
INFO  [2024-03-09 11:10:08.326755 | webserver] Provide /upnp/grender-64x64.png (image/png) from /usr/local/share/gmediarender/grender-64x64.png
INFO  [2024-03-09 11:10:08.326970 | webserver] Provide /upnp/grender-128x128.png (image/png) from /usr/local/share/gmediarender/grender-128x128.png
INFO  [2024-03-09 11:10:08.330216 | webserver] Provide /upnp/rendertransportSCPD.xml (text/xml) from buffer
INFO  [2024-03-09 11:10:08.331087 | webserver] Provide /upnp/renderconnmgrSCPD.xml (text/xml) from buffer
INFO  [2024-03-09 11:10:08.333699 | webserver] Provide /upnp/rendercontrolSCPD.xml (text/xml) from buffer
ERROR [2024-03-09 11:10:09.336410 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (59s)
ERROR [2024-03-09 11:10:10.338959 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (58s)
ERROR [2024-03-09 11:10:11.341519 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (57s)
ERROR [2024-03-09 11:10:12.344148 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (56s)
ERROR [2024-03-09 11:10:13.346631 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (55s)
ERROR [2024-03-09 11:10:14.349214 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (54s)
ERROR [2024-03-09 11:10:15.351739 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (53s)
ERROR [2024-03-09 11:10:16.354234 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (52s)
ERROR [2024-03-09 11:10:17.356931 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (51s)
ERROR [2024-03-09 11:10:18.359689 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (50s)
ERROR [2024-03-09 11:10:19.362407 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (49s)
ERROR [2024-03-09 11:10:20.364892 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (48s)
ERROR [2024-03-09 11:10:21.367469 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (47s)
ERROR [2024-03-09 11:10:22.370097 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (46s)
ERROR [2024-03-09 11:10:23.372596 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (45s)
ERROR [2024-03-09 11:10:24.375115 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (44s)
ERROR [2024-03-09 11:10:25.377874 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (43s)
ERROR [2024-03-09 11:10:26.380537 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (42s)
ERROR [2024-03-09 11:10:27.383292 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (41s)
ERROR [2024-03-09 11:10:28.386072 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (40s)
ERROR [2024-03-09 11:10:29.388837 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (39s)
ERROR [2024-03-09 11:10:30.391421 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (38s)
ERROR [2024-03-09 11:10:31.394304 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (37s)
ERROR [2024-03-09 11:10:32.397101 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (36s)
ERROR [2024-03-09 11:10:33.399625 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (35s)
ERROR [2024-03-09 11:10:34.402134 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (34s)
ERROR [2024-03-09 11:10:35.404896 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (33s)
ERROR [2024-03-09 11:10:36.407541 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (32s)
ERROR [2024-03-09 11:10:37.410061 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (31s)
ERROR [2024-03-09 11:10:38.412644 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (30s)
ERROR [2024-03-09 11:10:39.415292 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (29s)
ERROR [2024-03-09 11:10:40.417870 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (28s)
ERROR [2024-03-09 11:10:41.420284 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (27s)
ERROR [2024-03-09 11:10:42.422868 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (26s)
ERROR [2024-03-09 11:10:43.425331 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (25s)
ERROR [2024-03-09 11:10:44.427747 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (24s)
ERROR [2024-03-09 11:10:45.430251 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (23s)
ERROR [2024-03-09 11:10:46.432983 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (22s)
ERROR [2024-03-09 11:10:47.435600 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (21s)
ERROR [2024-03-09 11:10:48.438184 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (20s)
ERROR [2024-03-09 11:10:49.441108 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (19s)
ERROR [2024-03-09 11:10:50.443670 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (18s)
ERROR [2024-03-09 11:10:51.446288 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (17s)
ERROR [2024-03-09 11:10:52.448816 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (16s)
ERROR [2024-03-09 11:10:53.451366 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (15s)
ERROR [2024-03-09 11:10:54.453991 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (14s)
ERROR [2024-03-09 11:10:55.456432 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (13s)
ERROR [2024-03-09 11:10:56.458928 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (12s)
ERROR [2024-03-09 11:10:57.461354 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (11s)
ERROR [2024-03-09 11:10:58.464262 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (10s)
ERROR [2024-03-09 11:10:59.466924 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (9s)
ERROR [2024-03-09 11:11:00.469386 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (8s)
ERROR [2024-03-09 11:11:01.471886 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (7s)
ERROR [2024-03-09 11:11:02.474410 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (6s)
ERROR [2024-03-09 11:11:03.476872 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (5s)
ERROR [2024-03-09 11:11:04.479457 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (4s)
ERROR [2024-03-09 11:11:05.482083 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (3s)
ERROR [2024-03-09 11:11:06.484781 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (2s)
ERROR [2024-03-09 11:11:07.487231 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (1s)
ERROR [2024-03-09 11:11:08.489693 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Retrying... (0s)
ERROR [2024-03-09 11:11:08.492073 | upnp] UpnpInit2(interface=(null), port=49494) Error: UPNP_E_SOCKET_BIND (-203). Giving up.
ERROR [2024-03-09 11:11:08.492239 | main] ERROR: Failed to initialize UPnP device

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Unordered list of things that might help troubleshoot the issue:

Here are three issues I've read but that haven't helped me so far : #184 #157 #129.
And this SE question : https://raspberrypi.stackexchange.com/questions/79004/howto-install-upnp-dlna-media-renderer#79005

I tried both the 0.0.9 (via apt) and the 0.1 (following the instructions in INSTALL.md), and both give me the same errors.

As I use SSH to launch gmediarender I am sure that my raspberry pi is properly connected to my home network.
On my linux laptop (distro: Fedora 39), I installed gmediarender version 0.0.9 using dnf and everything works out of the box just as it should.
-> So I don't think it's a problem with my network.

Lastly, I don't understand why interface=(null). I tried using the -I option to change the interface name but I have no idea what it could be so I just get UPNP_E_INVALID_INTERFACE (-121) instead.

Hope someone here can help!

[mill1000]

Maybe try changing the port number with the --port option. Perhaps there is something already claiming the default port number.