Firewalls sometimes block the connection between FT Comm2 on your computer and FastTrack's servers. If you are unable to connect or get an Invalid Socket Descriptor error message, a firewall is most likely blocking the connection. Firewalls can be setup to allow  FT Comm 2 permission to access the Internet. Here are some useful support links to help you resolve the firewall problem. How Firewalls Work Norton Firewall Support (symantec) McAfee Firewall Support Microsoft XP Firewall Zone Alarm Firewall Support