AT&T VPN Gateway Firewall Ports

If the VPN Gateway is installed behind a firewall, the following ports need to be opened for normal operations.

PORT PROTOCOL DIRECTION APPLICATION

ESP(50)
in/out IPSec Tunnel
9 UDP, TCP out Upstream Bandwidth Test
13 TCP out Time Synchronization
20 TCP in FTP Data Channel for Code Upgrades
20 ICMP out Proactive Monitor Request
21 TCP out FTP Control Channel for Code Upgrades
21 ICMP in Proactive Monitor Response
22 TCP in SSH Remote Management
53 UDP out Client DNS and WAN Connectivity Testing
443 TCP in HTTPS Remote Management
500 UDP in/out IPSec ISAKMP Negotiation
4500 UDP in/out IPSec NAT-T
5080 UDP, TCP in/out SM-X - Auth, and VIG Health/ Latency Check
8080 TCP in HTTPS Remote Management
9920 TCP out Remote Access Repository Logging