Filtered Ports

UTOPIA

We do not filter any ports for UTOPIA customers.

Yellowstone Fiber

We do not filter or block any ports on Yellowstone Fiber. However, while we are not filtering any ports, if you need port forwarding, please contact XMission for a static public IP address.

Colocation

We do not filter any ports for colocation customers.

Dialup

We currently filter (block) the following ports on all 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.