Plex server on Win 11 stops working, doesn't allow remote connection

As this has been posted in a separate category and nobody answered two different posts, I’m asking in the general area in hops that somebody will find it and answer. the error message is:
app.plex.tv is unable to connect to “MainSys1Plex” securely
Its “Secure connections” setting may be set to disabled, or you may need to adjust some settings on your network.
The problem is there are no “secure connection” settings that have changed from when it used to work and now. Also, I can restart the server and it all goes away until it mysteriously starts again without warning and stops working when it just worked. I could be watching a movie remotely, finish the movie and try and go back to choose another and this message come up. So, it worked on both locations. Also, it doesn’t matter the unit I try to connect with, desktop or laptop or tablet. They all have the same issue on three different browsers too.

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