set realmlist eu.logon.worldofwarcraft.com
set patchlist eu.version.worldofwarcraft.com
set realmlistbn ""
set portal eu
Change eu.logon.worldofwarcraft.com to your servers IP and restart WoW.
Still doesn't work? You can try to ping the server by going start->run then type CMD.
When the black window popup type ping IP
If you get a ping out it's probably a server problem or your firewall.