Can't connect with more than 2 people

So I’m sitting here having a LAN-party with my buds, and we wanted to play some Rust.
But only 2 of us can join a server, when the third/fourth one joins, the first 2 gets disconnected.
Please help me resolve this issue.

Thanks in advance


PS. Sorry if this is the wrong place to post, but no one would answer in the other bug report forum