Hi, I'm having a hard time with this error as well. I either get into the game and not long later get booted saying I don't have internet connection: or I get the login failed error.
I know I have connection, because everything else works and have repeatedly reset/reboot and tested.

Currently uninstalling the game and will reinstall tomorrow. This has been going on for awhile now. I also tried to submit a ticket viat this site, but according to support it's not accepting my login.