We have found that this issue is caused when your IP is switching too quickly from the time you enter your login information and when you attempt to actually log into the game client. If you are receiving this error message when attempting to log in, you can try one of the following to help resolve your issue:
- If you are running a proxy or cache server, please disable these before attempting to login
- If you use 2 or more NIC cards, you need to disable all but one
If neither of the above worked, you will need to contact your ISP in regards to your IP switching too quickly for a resolution.