Cannot login to web app using Firefox

Plex Media Server
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1

Server Version#: 1.19.3.2852-219a9974e
Player Version#:

Problem: Beginning recently I cannot login to the web player using Firefox anymore, when accessing through localhost (127.0.0.1) or local network.

Symptom:

  • When opening web app’s homepage, a progress wheel briefly shows before the page redirects to app.plex.tv/auth/,
  • Upon signing in through the auth portal, the page navigates back to local server, before redirecting to app.plex.tv/auth/ again, this time saying “There was an error signing in”
  • This will repeat forever.

Platforms and software tried:

  • PMS on macOS (1.19.3.2852) and Raspbian (Raspberry Pi) (1.19.3.2764)
  • Firefox on macOS (76.0.1, latest) and Raspbian (68.8.0esr)
  • Unaffected: Other browsers, such as Chrome, Safari, and Firefox on iOS.
  • Unaffected: Other methods to access PMS, such as through mobile app, and app.plex.tv
  • Unaffected: Firefox Developer Edition (77.0b9, latest) (this makes it seem like a Firefox issue)

Attempts to fix:

  • Logging out and then logging in again; logging in using another Plex account
  • Clearing browser cache, clearing website data for plex.tv, localhost, and 127.0.0.1 domain, using Private mode, disabling Firefox’s Enhanced Tracking Protection
  • Removing PMS preferences and reinstalling PMS

I’ve seen a few topics on this issue now. Any help to fix, hints on troubleshooting, where to find logs, etc. are greatly appreciated. Thanks!

2

Please read There was an error signing in (AGAIN!).

3

Thanks for pointing that out! I will join that thread instead.

4

Hi, i have the same problem but the linked-to solution does not work for me (either does not exist or is private). Is there a way for me to get access to that thread, or find the content if it no longer exist?

best regards

5

I also have this problem on Firefox running on Ubuntu if it matters.
I assume my credentials have expired and it is not redirecting to login page.

6

Greetings,
same Problem with latest Firefox here - Edge is working ?!
And the solution cannot be accessed …

Garfield

7

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