Filtered Ports

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DSL

We currently filter (block) the following ports on all DSL and Dialup connections by default:

  • 19 (udp) chargen
  • 53 (udp) domain - IP addresses that test positive for open recursion DNS servers
  • 123 (udp) ntp - IP addresses that test positive for open query NTP servers
  • 135 (tcp, udp)
  • 137-139 (tcp, udp) NETBIOS
  • 445 (tcp, udp) Microsoft-DS (CIFS)
  • 1900 (udp) SSDP
  • 1433, 1434 (udp) MS SQL Server
  • 4444 (tcp) Worm-sign
  • 31337 (tcp) BackOrifice

We filter and block these ports by default to cut down on the number of 'drive-by' infections.

UTOPIA

At this time we do not have any filtered ports for customers specific to UTOPIA