In the AT&T router config under Firewall > IP Passthrough, I have Allocation Mode set to Default Server and the Default Server Internal Address set to the IPv4 address of my server.
The server is a Mac Mini and under System Preferences > Sharing, Remote Login is checked. I can ssh to the server from the LAN, but not from the outside.
Again, this used to work just fine, but then it stopped and I'm not sure what changed.
Update: Under Firewall > NAT/Gaming, I added SSH server there and that works. But why won't the IP Passthrough still work?