Game Patching

This method requires specific patches to the game you're running.

It requires some researches before patching the game, and keep in mind that domains that are longer than "gamespy.com" could not be patched without extensive modification to the application.

This method directly changes the pointing domain (gamespy.com) into an existing domain. Keep in mind that this is the ONLY method that dosen't require SSL patching if the CA certificate is valid.

Generic Patching (Manually)

Usually the gamespy IPs are inside the main executable. With an HEX editor find "gamespy.com" and replice it with the domain you want. DO NOT replice the subdomain since they're used to comunicate with the server.

If your domain name is smaller than "gamespy.com", just add a bunch or 00 until it fits it (It should work...).