World of WarCraft (build 12340) error

Q u o t e:
First thing I would recommend is reverting the SET RealmList back to a legitimate server. Playing on private servers is bad mojo - they're often laden with malware to get your account compromised, and they're also illegal.

Indeed, that should be set to : us.logon.worldofwarcraft.com

You'll want to avoid accessing third party servers, Tayk, as they not only are illegal and can result in the permanent closure of your World of Warcraft account but they can and lead to compromise of your active account.

As for the issue itself, check out the following post which can be found in our Technical Support forum.

http://forums.worldofwarcraft.com/thread.html?topicId=10021039&sid=1&pageNo=1#8