Port forwarding troubleshooting

[gatorback]

RT-AC68U with Merlin 378.55:

I am unable to access devices from the WAN, that I was able to access two weeks ago. There are three devices, which are pinned so that a unique WAN port can be forwarded to the device.


WAN = > Portforwarding => Enable Port Forwarding=Yes

Questions:
1) Is there any settings that could block port forwarding?
2) Is there a systematic diagnostic to identify the problem and remedy?

Any actionable guidance \ diagnostic questions are appreciated. Thank you

 

[abailey]

You have probably already checked this if your WAN IP is DHCP, but has your WAN IP address changed?

 

[gatorback]

Excellent question: When testing, I use an explicit IP address and check the IP address with www.whatismyip.com to verify that I am using the correct IP address.

I had been testing it from the LAN, but a test from a remote WWAN box confirmed that SSH traffic is properly forwarded.

Why is SSH (originating from the LAN through the WAN side of the router) not reaching (connection timeout error) the target SSH servers?

Here is a snapshot of the port-forwarding log: