Gameservers not listing in master servers

[L3gacy]

We originally ran our master server on Windows Server 2003 x64 and had all of our gameservers operating correcting. We recently had to reinstall our server and are using Windows Server 2008 x64. Due to a hardware issue we were unable to recover our game files and certain settings but we managed to save the TCAdmin database. Using the same config files that worked previously our Half Life/Gold Source games (Counterstrike 1.6), Battlefield Vietnam, Warsow, and now certain Source games are not listing in the master servers. The source games were all working and have just recently begun to stop working. We have heard that Quake based games may not be compatible with Server 2008 and may explain Warsow. Does anyone have any ideas why these gameservers might be behaving this way? Windows Firewall is enabled but I have tried temporarily disabling it to test every game. The server is in a datacenter and is not behind a NAT. I would greatly appreciate any help with this.