Delete rust from you machine. Not sure of the exact path but its in the steam directory under steam apps. Im not at home so cant check. But delete the whole rust directory
I got into the first server I tried but then when I left it and tried to connect to a different one, I got the same problem.
And the weird thing is that I got no problem playing on "Rust Legacy", only when I pick "play Rust" and not "play Legacy".
Sorry if I'm miss spelling some words, got a broken collarbone so I'm typing with one hand.
Edited:
So the problem still exist.
If you know how to fix it, please help me.