No libraries available on Android or Sonos, but works locally

Plex Media Server
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1

Server Version#: 1.42.2.10156
Player Version#: 2025.31.1 (Android)

Since some time ago, my movie and music libraries are not available on the Android or Sonos apps, for streaming to TV and speakers. I can run the web app from my laptop OK, and access the media libraries there. But the Android app says “no libraries available” and to check if my server is running and accessible. I can see the list of libraries that should be there, but they all have an exclamation sign and a message “the server appears to be offline”.

I have indeed no remote access to my server, but everything should work on my local network. In the server settings for remote access, it says that the server is logged in to Plex but cannot be reached outside my network.

Do I need to enable remote access now in order to use the Android Plex app on my local network?

Edit: After setting up port forwarding for port 32400, the server-side message turns green and says that the server is available remotely – but only for a minute. After refreshing, it turns back red. And no change in the Android app or Sonos.

2

Your server installation is faulty. You are currently rate-limited for new cryptographic certificates, because you are requesting a new certificate almost daily, or sometimes several times a day.
Inspect your plex data folder, particularly the access permissions thereof. The certificate is stored within it, and if that certificate is no longer accessible, damaged or missing upon the next server start, a new certificate is requested.

Without a working certificate, secure connections are not available. Without these, most clients will not communicate with your server-

3

Thanks for the tip! The data folder and all the files in it are owned by user/group plex/plex . The folder has permissions drwxr-xr-x. It contains about 1700 zero-byte files Preferences.xml.tmp.* plus Logs, Metadata, etc, but I see nothing that is obviously related to the certificate.

4

Ah, but now it does work. Some time during the day, the server apparently managed to install a certificate anyway.

The log says:
Dec 26, 2025 13:50:52.486 [139775407377208] DEBUG - CERT: Downloaded new cert from ``plex.tv``; took 11 tries.
Dec 26, 2025 13:50:52.508 [139775466142520] DEBUG - [CERT] Subject name is xxx
Dec 26, 2025 13:50:52.508 [139775466142520] DEBUG - [CERT] Installed certificate with fingerprint xxx

Now movies in the Android app works fine. However, still no lock with Sonos but maybe that is another issue.

5

The real cause is still unsolved.
Something is either invaildating, deleting, or otherwise making the cert unavailable. It is supposed to be valid for about 3 months. So requesting a fresh one at least daily will be sanctioned.

6

Hey, I think I might have a similar issue.
My plex server logs are filled with:

WARN - [HttpClient/HCl#30] HTTP error requesting GET https://plex.tv/media/providers (6, Couldn't resolve host name) (Could not resolve host: plex.tv)

and

Feb 07, 2026 13:19:16.136 [132399741131576] WARN - [HttpClient/HCl#2c] HTTP error requesting GET https://plex.tv/api/v2/server/access_tokens?auth_token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
7

This is a completely different issue.
Set the “DNS server” in your router’s settings (or in the network settings of the Plex client device) to either 1.1.1.1 or 8.8.8.8

8

Thanks for the quick reply! For future reference, I was messing with tailscale on my server a couple days back, which caused these issues.