Can't connect with more than 2 people

Yo!
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

/Tim

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