Can't connect to my own dedicated server

[WesleyT245]

I'm having a problem with my own dedicated server, where I can't exit the caves without getting disconnected with a "Server not responding" error. This is what shows up almost immediately in the server logs after I try to enter the stairs. In addition, I often have difficulty joining the server after this happens. Also, I only use the Setpiece Config mod on the server. Pls help.

Update: I tried using someone else's steam account on my own computer, and it is still having similar problems. For this reason, it is most likely not a Steam account problem, but rather something to do with my way of connecting to the server.