Cannot Access Plex Server on QNAP After Router Change – Possible Claimed Server Issue?

Plex Media Server
1

Setup:

  • QNAP TS-451+

  • Plex Media Server (fully updated)

  • New router recently installed

Issue: After installing a new router, I can no longer see or stream my media through Plex. However, I can access media stored on the QNAP directly from my PC (hardwired to the router), so the NAS itself is connected and functioning.

What I’ve Tried/Observed:

  • QNAP Ethernet port 1 stopped working after the router change; I’m now connected via port 2

  • Confirmed the Plex app on QNAP is fully updated

  • Direct file access to QNAP works fine—only Plex is affected

Suspected Cause: I believe this may be a claimed server issue caused by the new network configuration. However, the “Claim Server” prompt is not appearing in the Plex interface, and I cannot find a way to trigger it manually through the settings menus.

Question: How can I force a server reclaim via SSH/command line on QNAP, or otherwise re-establish the connection? I tried and tried again but have been unable to do this. Any guidance appreciated.

Screenshot 2026-01-12 210526
Screenshot 2026-01-12 2105261687×982 76.5 KB

2

SSH into the machine via your normal username.
sudo bash to elevate to root (what ‘admin’ really is) privileges.
Now, with UserCredentialReset.sh in /share/Public,
you can invoke it from the command line, give it the claim token when asked, and it will force reclaim the server.

Instructions are in the README.md with example (how it will look on QNAP)