Update:
There are various problems relating to Battle.net accounts, from the looks of it it's not just related to WoW Tunnels & Proxies. There have been many users reporting on the official World of Warcraft forums problems logging in. These problems are mostly caused by DNS issues.
Invalid Game Server / Login server down Message
- Code: Select all
Open C:\Windows\System32\Drivers\Etc
Now there should be a hosts file, right click the file and go to properties, now uncheck the "Read Only" property and click Ok.
Then open the hosts file with Notepad.
Add this to the end of the file:
12.129.206.130 us.logon.battle.net (or 213.248.127.130 eu.logon.battle.net) for EU sers.
Now save the hosts file and the error should be fixed.
Example:
If you're using Freecap please also double check the DNS resolution setting is set to "Local then Remote", if that doesn't work also try Local and Remote options.