World of Warcraft traffic shaping wizard rules
It looks like Blizzard decided to add more ports to the ones World of Warcraft uses.
Anytime your computer receives incoming data, it is sent to a "port". Your computer has many ports that can receive data, and different activities will utilize different ports. World of Warcraft & Burning Crusade use TCP port numbers 1119, 3724, 6112, 6113, 6114, and 4000 to play, and UDP port 3724 for in game Voice chat. The Blizzard Downloader, which downloads patches, also uses TCP ports 3724, 6112, 6113, 6114, 4000 and the range 6881-6999. For walkthroughs on router and firewall configuration you can use the Networking Help for the Blizzard Downloader page.
I was wondering why my ping was above 2000 (my room mates like Bittorrent) after I decided to play after a couple of months, turns out that's why. I updated my traffic shaping rules and all is well again.
The main connection from the client to the server uses tcp 1119 now instead of tcp 3724.