Server connection problems.

The server I am trying to join is Darkstorm Build server, with the IP address of I have talked to developer of server and he does not know what to do. I have already made a post asking for help in their forums. Apparently the only time I was able to connect to the server was when the developer on this server invited me to play on steam. Other than that, I have not been able to connect.
Whenever I join the server I time out the first time connecting, then the second time I get the red text at the top right of the screen saying warning connection problem auto reconnect in 897.22 seconds. (not exact numbers but who cares) I have tried reconnecting to server, I have tried quitting game and coming back to it, I have tried restarting my computer. I have tried re-installing garrysmod, I have restarted my router. nothing seems to be working. Please help.