Blocked port 445 (Answered)

Comcast Business blocks certain ports to protect our customers and the integrity of the Comcast network. These blocks cannot be lifted.

Per recommendations set forth by the United States Department of Homeland Security’s National Cybersecurity and Communications Integration Center and the Computer Emergency Readiness Team, Comcast Business Internet blocks Port 445 over the public internet in our network.

View a list of additional Port's blocked on Comcast's Network.

We are aware of the need to use port 445 for Microsoft® Azure files. Microsoft® provides the following documentation helping you work around the need to directly use port 445 over the public internet:

• Microsoft’s guide to Use an Azure file share with Windows
• Microsoft’s guide to Troubleshoot Azure Files problems in Windows
  • Cause 1 is related to port 445 being blocked over the public internet and provides potential solutions.