This is the script I gave you (mostly).
I moved a few things around so the was easier to read and maintain.
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PMS v1.23.4 from QNAP store (says latest release?!?!).
QNAP Fireware 5.0.0.1870
QNAP TS-451+
Similar problem to folks here: Following the last update (not sure if firmware or Plex) the PMS just fails and fails. I have reinstalled numerous times. Please release a new update to help folks and fix this issue in the QNAP store.
QNAP App Store has not yet updated. They always lag behind.
Please Manual Install from plex.tv/downloads
done.
Ok, the way around this for me (low tech way)
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I uninstalled the non-working version. Then used the QNAP App interface to reinstall it. Logged into the PMS local web interface.
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There it suggested “Your version is behind…etc” so I clicked the manual download option and it allowed me to directly download :PlexMediaServer-1.25.1.5286-34f965be8-x86_64.qpkg"
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Switch to the QNAP web management interface and go to the APP center. There I clicked on the “Install Manually” button in the top right.
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Select the QPKG and did the install manually there. This so far seems to be working for me. And for once I don’t have the annoying “your version is old” message popping up on the PLEX web interface…
Hopefully this helps the folks that have a broken PMS and don’t want to be doing SSH and all that jazz.
1.25.1 or 1.25.2 ?
1.25.2 .5319 has the updated control scripting
you’ve never needed to install via SSH and all that jazz 
Please download from Plex.tv (1.25.2.5319) – Plex Pass
and install that version.
We’ll get this control problem resolved by upgrading.
Qts 5.0.0.1870
PMS 1.25.2.5139
Qnap TVS-871 Core i7 4790s no auxiliary gpu
When I open Plex in the app center, I get the following error message:
Not Found
The requested url was not found on the server
The address bar is showing that It is linking to the NAS’s IP address and to the port I have assigned to Plex.
I’ve tried downgrading Plex, but that didn’t help.
How do I fix this?
It was working fine 12/1/2021
Thanks!
What URL ?
It sounds like PMS didn’t start.
Do you have a PlexData share or access to the command line (SSH) ?
If you have the PlexData share, drill into it …
Plex Media Server / Logs / Plex Media Server.log
Does it say something about “Address already in use” ?
Installed 1.25.2.5319 on my QNAP TS-453BT3, firmware 4.5.4, still cannot open web interface of Plex
edit… reboot and its working for now. Ill update this thread if it dies
@ChuckPa Thank you for your hard work to fix this
I have also been having this issue. Latest update ( Version 1.25.2.5319) doesn’t fix it. 
Not knowing if you had processes hung, Did you restart QTS after install ?
multiple times.
Time for the basics:
- LAN IP addr of the QNAP
- LAN IP addr of the machine you’re opening it from
- Are you opening it using http://ip.addr.of.qnap:32400/web or https://app.plex.tv ?
The address isn’t in use as it is reserved by my router/ firewall for my NAS.
IP address of the PC is 192.168.0.63.
I have tried accessing it by the app and by the IP address (192.168.0.43/32400/web).
I don’t know how to use SSH. Are there any instructions available for ssh? I have rebooted the nas several times and have stopped/ restarted the Plex app via the app center multiple times.
Any other ideas?
@ChuckPa …no issues so far…
You mean I get to keep my job?
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I’m going to ask for precise syntax here, ok?
because it does matter.
