Log into it.
Look for the port forward list. (most allow you to see and manage it).
When you find it, remove all the Plex port forwarding entries
Go to Plex → Remote Access
Make sure it’s in automatic mode.
Make sure port 32400 on the computer’s firewall (TCP) is open.
Restart Plex.
The “Nothing’s changed” usually includes the clause “… that I’m aware of” 
You have a windows computer. ANYTHING can change 
True about the “nothing changed”, I was in a hurry with my reply as I had dinner on the grill. It is always interesting to be on this side of the “help desk” as I have spent 30+ years asking people, “what changed?” And you are so right about Windows, I keep threating to run stateless VMs…
If it wasn’t for all the others reporting the same issue, I would say it was something stupid I did, or Windows did, and I am just overlooking it.
Anyway, I tried all that when the issue started. Until the issue started, I did not have any thing in the port forwarding for Plex. Even a few years back before I upgraded the router. I have rebooted, and reset, we even have had power outage after one of the big windstorms, so everything was powered off for 12hrs…
Again, the thing that makes me think it is something on the PLEX side of the internet is that right now, by using a custom port the only thing that does not work is the PLEX “redirect” back to my server. I assume it looks up my account info and magically knows how to find my server from some sort of DNS like data base, that seems to be broken.
Just taking wild guesses because I have no idea how they coded all that. 
I bet this means something… I wonder if this all started with the change PLEX made to all the APPs that run on the TV and Firesticks, and everything else, that caused a day of resetting and relogging in to clear the issues with secure connection being broken.
Remote Access is for the Server.
The apps key off Plex.tv
If the app can reach the server on the local LAN – Remote Access isn’t used because the server is “Local”.
This whole Remote Access failing has always puzzled me.
I run a pfSense firewall. It is the DHCP / LAN domain manager.
I’ve never had any issue whatsoever with Remote Access not working and I have 3 servers always running with 2-3 more at any given time for testing.
When I was using DSL, with the ISP-provided modem, Remote Access NEVER worked no matter if I manually port forwarded or used Universal Plug & Pray.
Regarding this Secure Connection stuff.
What this means for those apps is just as written in the announcement about how to mitigate the core problem ( expired device certificate ).
Do you have the server requiring secure connection ?
Do you have the apps set to allow “insecure on LAN” ?
You know you can make exceptions for any LAN or WAN IP in Settings - Server - Network ?
So, what have we learned…?
During the troubleshooting of all my devices suddenly complaining about secure connections, I changed the secure connection setting to “disabled” as that seemed to help.
Then sometime later my wife tried to access //plex.tv/web from her desktop and it fail as describe above. So, I checked the remote access, and it was acting up. I had not noticed this because we haven’t left the house in 2 years thanks to the pandemic. So, I don’t know how long it had been broken. That is when I found that I had to do the manual port forwarding to get a solid remote access connection. But even though I could connect remotely using my public IP and custom port the “plex.tv.web” redirect still would not work. And that led us here.
So, while the UP&P on port 32400 still does not work, I can get the PLEX redirect to work by putting the secure connection setting back to “preferred” and my devices still can connect.
Also, because we recently had a power outage that lasted longer than Comcast batteries and I have a generator, I made the change to the settings so I can use PLEX on my LAN when the internet is down.
Now as long as everyone keeps their hands in their pockets and doesn’t touch anything…
Things are working.
Now I need to get back to my Bond movie watching so I am up to speed by the time No time to Die gets here!
Happy Holidays!
I’m experiencing the same issue. Remote access has been working almost flawlessly for three years now, but suddenly it’s gone.
I tried rebooting my DSM 7 server which usually helps when my server is no longer accessible - either at home or remotely. Now back at home in Switzerland from a vacation in Spain (where this first occured) I rebooted my router, updated to the latest Plex build (1.25.3.5409-7000) - still the problem persists, my server (Bjørnflix) is not reachable, though the Remote Access status is indicating «Fully accessible outside your network».
I disabled UPnP protocoll on my router’s software, changed the specified port from 32401 to 32400 and also on Synology under Security - Firewall, but none of these actions seem to help, also after intensely discussing the issue with specialists on my ISPs community page. Of course, I also performed a complete shutdown (rebooted router, server and apps as detailed above) and reset the router.
Can you please let me know if you see anything from the logs? Your help is much appreciated.
Plex Media Server Logs_2022-01-24_21-12-22.zip (2.0 MB)
Also, quite strangely, since Remote Access no longer works, Plex fails to find any subtitles via search and also fails to match movies. I had to edit my latest additions completely manually…
Gladly, this could be resolved.
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