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I'd elaborate if I could. I'm kind of getting to the point of giving up since it's not effecting functionality, especially since several technicians have looked at this already.

"Block private networks" and "block bogon networks" are both unchecked. (This is true on both routers.)

o The webserver is running... # pgrep lighttpd
- This returns a number. Also, it appears to be running anyway since it's accessible from the LAN.
o The webserver is reachable via at least one interface.
- Accessible from LAN.
o Firewall logs show no block rule for GUI access via WAN.
- Can't find any block rule.
o If there is traffic being blocked, click symbol in first column to reveal which rule blocks.
o Port and NAT for GUI active? HTTP or HTTPS?
- Appears to be the case? Both HTTP and HTTPS.
o Is WAN an internal network? IPv4 or IPv6. Bogons and private stuff being blocked by default?
- WAN is a public network. IPv4. Web interface is not accessible from other IPs on the WAN.
- I know I've seen the bogon option before, but I'm not finding it again. I feel like it's buried at the bottom of another config. page. Someone remind me?

Okay, I've narrowed this down a bit. For some reason traffic is blocked from the WAN that the router is connected to. That makes no sense as the only change that occurred was an update of the Opnsense router. Still can't find a local firewall reason for that, but I'm continuing to troubleshoot. Thanks for all the input!

No. I've tried rebooting. I've done a side-by-side comparison of the two routers to find any discrepancies (other than the obvious like IP address) and I don't see anything that would be causing this. I had a colleague look at it, too. I even asked around to see if there were any networking changes made. Nothing. We're baffled.

That doesn't seem to have fixed the problem. However, I was able to access the web interface through the LAN connection today since I'm on site. Still can't get to it from anything on the WAN, though.

I updated two opnsense devices using the built-in update from the console and on one of them I lost the ability to connect to the web interface. They are both running 15.7.14 and have very similar configurations. Both web interfaces were accessible before the updates. Can someone tell me some troubleshooting steps? I'm not a big linux user and I'm kind of at a loss for what to do beyond the obvious "select option 11 to restart the web service" step. Thanks.