SRX5308 GUI not visible from browser and all ports show closed on nmap scan

Hello all!

We have 5 locations that are connected via VPN using SRX5308 routers. They've been in place going back several years. Originally locations were connected using FVG318 routers and those were replaced over time with the SRX5308. Everything has always worked great and we've been very pleased.

But recently I tried to login to a router at one of the locations and when I click my browser bookmark it reports:

Hmmm… can't reach this page

192.168.10.1 refused to connect.

This has never happened before. And I don't know when the problem started. The last time I recall logging in to the router was 4 or 5 months ago. The result is the is the same on a local pc or over the VPN.

Scanned the router's ports with NMAP locally on the network and found all of the ports are closed except for port 23.

This week I shipped a micro pc to the location and had it attached to the serial port on the router.

Using Puttty I'm able to login to the router, view it's configuration, update it's configuration, reboot it, but I don't see how to change the status of the ports from closed or anything to do with gaining access to the GUI.

Using Putty I did enable Remote Management, and when I view the status using Putty it shows enabled. But I can't connect that way either.

As for the router itself, it's functioning fine. The VPN is up and the locations are communicating normally. The port forwards for remotes, camera system etc all work as they should. I just can't access the GUI.

Anybody know what I'm missing here?

Thanks

Scot