Web Client Cannot Connect

Server Version#: 1.16.3.1433
Player Version#: 4.0.1
Today I tried to use the web client to view my Plex server (both on the same physical and logical network) and it says “unable to connect.” However, running the local Plex client FROM THE SAME COMPUTER AND BROWSER not only works fine, but it shows that my server is fully accessible from the internet.
It appears that my long-standing reason for NOT using the web client has been proven true — it can change without warning to something that doesn’t work.
FWIW, I tried using Edge (I’m running on Windows 10), Chrome and Firefox, with the same results in all. The WORKING local client is version 3.104.2.

I’m having the same problem. Plex server works from the localhost but will not work from web browsers on other network connected pcs. My Roku TV and Plex App on my phone still work. Logs attached.Plex Media Server Logs_2019-08-17_09-51-26.zip (4.9 MB)

Could you post a screenshot?
I might have an idea:
Settings - Web Client - General - ‘Show Advanced’ - “Reset Customization”

Two weeks ago, when I posted the message I could have, but whatever was wrong appears to have been fixed or just mysteriously stopped happening on its own.

The only client I have an issue with now is the FireTV app, which looked great six months ago when I got the FireTV, but has been in a steady decline towards completely unusable, which it finally reached this morning. But that was posted to another thread.

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