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 |