I had a Garry's Mod server up and running a few months ago. When I decided to start it back up again I had to update it. Once I finished updating, everything ran as usual, but this time noone could connect to the server. It makes no sense to me since my ports were forwarded and, after checking again, still are forwarded. I also have AVG so I made sure to allow the server through the firewall for AVG, Windows, and my router. I haven't changed anything since it last worked, so as far as I know, there shouldn't be a problem.
It was a dedicated server downloaded through SteamCMD and ran ULX, ULIB, and TTT commands for ULX, as well as workshop hosted maps and plugin.
Has anyone else had this problem and fixed it? Any help would be greatly appreciated