Can't create server (license) EXPERIMENTAL (Rust)

As such, I have already created a server, but there was a problem when connecting other players, what me (it shows 2 of my servers with local ip and with the usual one, I can only log in locally). The port is open (28015), DMZ is enabled (and in general it is 1 game in which I cannot create a server...). After digging a little further, the server even appeared in the general list, but that's bad luck, when connected, it gives out: "Disonnected (Connection Attempt Failed)" . And after that I went into a stupor (by the way, the server created normally in alpha). I would be grateful if someone could give me an idea to fix this problem.