How can I protect the connection of some computers on the local network to my Throne using the login and password for the proxy on port 2080?

[Sheredeka]

I have several computers, and I would like to use only one instance of Throne. Is it possible to set a username and password? to use a proxy that is allowed to other computers.

[throwaway972]

If I understood correctly what you're trying to do, you'll need to add a custom inbound like this:

{
    "inbounds": [
        {
            "domain_strategy": "",
            "listen": "0.0.0.0",
            "listen_port": 2081,
            "tag": "mixed-in-custom",
            "type": "mixed",
            "users": [
                {
                    "password": "pass",
                    "username": "user"
                }
            ]
        }
    ]
}

As for the default inbound proxy, I think that if you leave it at its default 127.0.0.1 listen address, other PCs won't be able to access it. However, just in case, you can use a routing rule like this:

{
    "action": "reject",
    "inbound": [
        "mixed-in"
    ]
}