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 
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