Xfinity Forum Archive...
This is an archived section of the community.
Content in this area has been identified as outdated or irrelevant.
This change was done in an effort to make the forum easier to use and to keep only the most helpful and recent content active.
Post your questions in the Xfinity Community
Opening closed ports: 123, 443, 500, 4500. These are AT&T requirements for the Cisco Microcell.
All was okay until I upgrade to the new X1 modem.
you marked the thread as answered