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The following ports are blocked for outbound traffic with all dynamic IP addresses.

  • 25 - SMTP
  • 137 - NetBIOS Name Service
  • 138 - NetBIOS Datagram Service
  • 139 - NetBIOS Session Service
  • 445 - Microsoft Directory Service (Windows file sharing, SMB/Samba)

For more information on ports and associated services please see the following Wikipedia entry.

https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers