Frontier restricts and blocks known ports that in the past have allowed for the transfer of spam, viruses, and other malware. The ports are:
25, 135, 137, 138, 139, 445, and 1025
Port 25 restriction will take place on all dynamically assigned blocks, which would include Business Class High- Speed Internet customers when they are using dial-up access.
Blocking on TCP/UDP ports 135, 137, 138, 139, 445, and 1025 has been implemented for Residential and Business Dialup customers, and Residential High-Speed Internet customers. Business Class High-Speed Internet customers will not be affected by TCP/UDP blocking unless they are using dialup access.
No blocks will be placed on Business Class High-Speed Internet, Symmetric High-Speed Internet and FrontierNet Direct (T1 or larger) customers.