by pauljlucas » Thu Feb 06, 2020 4:34 pm
So I had been able to connect to a server at home from the outside... until recently. I have dynamic DNS. For example, I used to be able to ssh ddns.myserver.org and it worked just fine. I also had a web server running on port 8001 that I can no longer access.

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?