[Opensim-users] Nat Loopback symptom but maybe something else???

[Erik Gordon Bainbridge]

I think the cause of my problem is pretty simple and maybe obvious, but I'm just not seeing it. 

I've been running a grid with 4 simulators and 13 regions since 2011 (grid.virtualmarin.com:8002).  I've made no configuration changes in 5 or 10 years, but suddenly I can no longer login from within my home network, though users from outside my network can log in.  It sounds like a NAT loopback problem, but my router configuration looks good and wondering whether it might be something in my OpenSim.  However I haven't changed either my router or OpenSim configuration. 

The server is a dedicated computer I built in 2011.  The operating system is OpenSUSE Leap 15.3.  It has two ssd's; one contains boot,  system and Home, the other has my grid.   The problem started immediately after I replaced the grid ssd.  After the problem started, I put the original grid ssd back in the computer and restored a backup to it, but the problem continues.  I was not having a problem before replacing the ssd.  I haven't changed anything else.

Here's what happens when I try logging in with Firestorm from within my network:
- The Firestorm progress bar stops at about 70%
- Robust shows my avatar making a login request.
- The relevant simulator shows my avatar logging in, but then one minute after the last "Creating agent" entry, it shows my avatar disconnecting.  Firestorm hangs and never responds further

I created several OpenSim grids a decade or so ago and used to have a reasonably decent understanding of OpenSim, but my grid has been so trouble free that it's allowed me to shift my attention to other things and ignore it's internals.  When I look at the code now, I realize how much I've forgotten.  I'm hoping someone can make suggestions for possible debugging steps or fixes.

I'll appreciate any suggestions.  Thanks!

System:
Opensim 0.9.0.1 with Diva Wifi
4 simulators and 13 regions
OpenSUSE Leap 15.3
Netgear Nighthawk Router(R7000)-AC1900