For clarification on what ports are blocked by COX on residential networks, go to http://support.cox.com/sdcxuser/asp/Cox_searchresults.asp and type 'ports filtered' in the search box. Second link from the top of the search results. Good details.
Port | Transport | Protocol | Direction | Reason for Filtering |
25 | TCP | SMTP | Both* | SMTP Relays |
80 | TCP | HTTP | Inbound | Web servers, worms |
135 | UDP | NetBios | Both | Net Send Spam/Pop-ups, Worms |
136-139 | UDP, TCP | NetBios | Both | Worms, Network Neighborhood |
445 | TCP | MS-DS/ NetBios | Both | Worms, Network Neighhood |
1433 | TCP | MS-SQL | Inbound | Worms, Trojans |
1434 | UDP | MS-SQL | Inbound | Worms, SQLslammer |
1900 | UDP | MS-DS/ NetBios | Both | Worms, Network Neighborhood |
TCP | Subseven | Both | SubSeven Trojan |
I forgot about slammer. Craig