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Error 11 - Authentication Error
Cause of Error 11

Error 11 is registered when the game client can't contact the Authentication server. This is caused by a firewall issue and means that the first step of authentication is not reaching the authentication server. The error message received is:

"Error ID 11 - The login process was unsuccessful because the client was unable to connect to any authentication server."

Solution

Please see this knowledge base article for help configuring your firewall:
https://support.istaria.com/index.php?act=article&code=view&id=22