I also host my site on it. It's an internap connection, low pings throughout the whole USA. Average is 13-16ms when I used it before to host TF2. Overseas it performs really well also with ping at about 160ms.
OK, here's a quick fix for you:
Go to base/server/scripts, make a file called "game.cs" and place the setKey command inside of it.
Right after the launcher finishes, delete game.cs.dso
Once you're sure the key was set, you can close the server and then delete game.cs for cleanup.
Where did you get that server and where is it located?