I've experienced the below issue, and I hope this thread serves as a place for others to confirm/replicate it on their services.
Adding the server in Steam works after selecting the Query port
Though the title is "Invalid Server"
Connecting to it, it prompts me for the password I set which takes.
Atlas reports "attempting to join server" meanwhile the service goes offline in the G-Portal page.
Have tried reinstalling the service, tried different server names. Any other ideas folks?