Unreachable server - ISP blocking?

Plex Media Server Desktops & Laptops
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Server Version#:1.13.5.5332
Player Version#:NA
Windows 10 pro x64 (1803)
Modem: Arris BGW210-700

I have AT&T Uverse and have had 0 problems (6 months+) running plex after I configured port forwarding. Maybe two weeks ago (at least when I noticed it) the server is no longer accessible outside of my network. Internal is fine.
If I monkey with the port settings, IP etc it will say accessible for up to a minute! before it then switches back unavailable.
I have called AT&T and they offered to fix the issue for $49 claiming they know what it is, and judging by the forums it appears they will unblock the port (if that is the issue) but I cannot get any real information out of them.

If I connect to my mifi or cell tether (Verizon) then I have no problems and it’s immediately available.
Plex Media Server Logs_2018-09-04_09-17-59.zip (173.3 KB)

Tried rolling back to earlier version of Plex (3mo old v.) but to no avail.
My spidey senses tell my this is AT&T’s doing.

Attached logs.
Removed email address

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change the port Plex uses.

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Done that a dozen times. No dice.

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I’m surprised that works. Most cell systems use CGNAT which would prevent you from enabling remote access.

As far as AT&T, it’s not something we are aware of. If they can fix it, then it’s very likely something on their end.

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Yeah I just loathe the idea of paying them $50 to fix it.

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Check your router WAN address and see if the public address on the Plex remote access page is different. If it is, it’s definitely something of AT&T’s doing.

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This is due to a bad firmware update that AT&T forced on all their Arris BGW210 gateways since early August, there was never anything wrong on Plex’s end. Here are my fix instructions, hopefully they work for you too:

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That did it man, thanks a bunch!

But now when I try and sign in internal or external it says Internal Server Error. Something went wrong on our end
It never ends does it lol

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Oh no :persevere: Hopefully it could just be some kind of cache issue? I also restarted Plex Media Server and my machine itself a few times, so maybe that’s the final piece of this stupid puzzle.

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I swear.
So it was “available outside my network” all afternoon after I did factory reset of the gateway but I couldn’t sign in at all from anywhere.
Kept saying it was an unclaimed server so I rebooted “claimed” the server and now its back to not available outside the network.
fml.
Version router is now running is 1.6.7

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Updated to 1.6.9 and it appears to be working.

For now…

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Nice! If they didn’t fix it completely in the new version, you can always downgrade to 1.5.12 like I did, it’s been working perfectly for me since I rolled back.

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