http://nw-forum.perfectworld.com/showthread.php?872201-Xfinity-Cisco-XB3-Router-accounts-server-connection-times-out&p=10420371#post10420371
Cliff Notes: Basic troubleshooting pinpointed the router as the problem. If anyone has any info on the ports needed to connect, let me know here or add it to the thread above. I'm curious to see if other people have this same problem with other routers.
Quick Symptoms: Can't even get to the character select screen, Client hangs on "connection to accounts server".