What ports are blocked by AT&T?

AT&T, one of the largest telecommunications companies, has certain policies in place regarding the blocking of specific ports for security and network management reasons. Here’s a detailed look at the ports that are blocked by AT&T:

Port 443 and Port 21: There have been reports from users that AT&T has stopped allowing traffic on ports 443 and 21. Port 443 is commonly used for HTTPS traffic, and port 21 is used for FTP (File Transfer Protocol). However, AT&T’s official stance is that they do not block any ports.

Port 80: Some users have reported being unable to ping their public IP over port 80 or 443. Port 80 is typically used for HTTP traffic.

Port Forwarding: AT&T allows users to set up port forwarding for user-defined applications. This means that users can open specific ports for specific applications or devices. However, some users have reported issues with setting up port forwarding correctly, leading to ports appearing as closed.

Firewall Settings: AT&T’s gateway settings include a firewall that can block certain ports. Users can check their firewall settings to see which ports are blocked and make changes if necessary.

Blocked Ports: It’s important to note that the blocking of certain ports can change based on network conditions, security threats, and other factors. Therefore, the list of blocked ports can vary.

In conclusion, while AT&T states that they do not block any ports, some users have reported issues with specific ports like 443, 21, and 80. If you’re an AT&T user and you’re experiencing issues with blocked ports, it’s recommended to check your gateway and firewall settings, and consider setting up port forwarding for the applications or devices you’re using. If you continue to experience issues, contacting AT&T’s technical support may be necessary.