1. Be sure UPnP is enabled on your Linksys device: See upnp section here Connection problems? Check here first! (click on link)

2. Did you configure your firewall so it allows LW full access (advisable not to have 2 active firewalls b/c they can interfere with each other); Firewall configuration instructions (click on link)

3. Have you checked with Comcast to see if either (a) you have gone over your monthly limit, (b) speak with a technician & find out if they are p2p filtering you.