The "hot" topic regarding Red Alert 3 verification is that the original verification servers have been deprecated or are sporadically offline. If you enter a valid code and the game says it cannot connect to the server to verify it, you are stuck in a loop.
Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Electronic Arts\Electronic Arts\Red Alert 3\ergc . Double-click the value on the right. reenter and verify your registration code red alert 3 hot
Does the error happen at or only when trying to play online ? The "hot" topic regarding Red Alert 3 verification