Plex is incredibly unstable

Plex Media Server
1

Server Version#: 1.43.3.10861
Player Version#: 1.112.0.359-0d79a49f

My main plex server (ip-86.248/24) is running on Docker < Ubuntu < Proxmox. I can visit & play on it anytime, if I login via local ip of the server on browser.

But on Plex app on Windows, Android, iOS, macOS, even on browser via plex.tv - that server comes & goes, randomly. Even when i’m playing something that server would suddenly disappear from the app.

Obviously there’s nothing wrong on the server, its always available on the ip. All of my devices, including docker itself is using gateway ip as DNS.

Things I’ve tried:

  • Relogin to all apps
  • Delete cache of apps
  • Toggle between every settings on network page
  • Server is claimed

plex
plex1807×1789 199 KB

2

Just an initial observation, don’t put spaces between the network addresses in “List of IP addresses..”

3

Also for LAN Networks.

192.168.86.0/24, 192.168.87.0/24 ← incorrect
192.168.86.0/24,192.168.87.0/24 ← correct

4

Fixed it, didnt fix the server disappearing issue.

5

Is there a reason for the custom user access URLs? If not, then remove them and restart Plex Media Server.


To see the server addresses registered with plex.tv, use https://plex.tv/api/resources?includeIPv6=1&includeHttps=1&X-Plex-Token=<your_plex_token>.

For example, if your token was 1a2b3c4d5e: https://plex.tv/api/resources?includeIPv6=1&includeHttps=1&X-Plex-Token=1a2b3c4d5e.

Obtain a Plex token: Finding an authentication token / X-Plex-Token.

Additional Info: Using plex.tv resources information to troubleshoot app connections

6

Also, try a public DNS server such as 1.1.1.1 (Cloudflare), 8.8.8.8 (Google), or 9.9.9.9 (Quad9). Some ISP DNS have problems resolving Plex hostnames.

7

My router is using google & cloudflare dns. And all other devices are using router’s DNS. So there shouldn’t be a problem with DNS here.

8

So that the clients can find the server, as i’ve toggled between every settings here.

I checked this. Here also my linux server (Mini PC) isn’t constant. It comes & goes.

9

You’ve two servers with unstable connections?

Are you running Kometa, Tautulli, or any other application that interacts with Plex? If so, any correlation between Plex instability and their interaction with Plex?

If possible, please try this:

  1. Double check all network settings (mask, default gateway, etc.).
  2. Ensure Plex is configured for debug, not verbose, log files.
    Settings → server_name → General + Show Advanced
  3. Remove the custom access URLs.
  4. Remove list of IP address allowed without auth (for testing, will force clients to authorize with plex.tv).
  5. Set Settings → Network → Client Network to IPv4 Only.
  6. Reboot router. Wait for it to fully boot.
  7. Restart Plex Media Server.

The next time a connection drops:

  1. Restart Plex (this bumps the log files)
  2. Wait 2 - 3 minutes for Plex to fully boot & log the startup sequence.
  3. Pull and post the log files (the full .zip file).

Hoping that simplifying things (IPv4 only, no custom urls, etc.) will help pinpoint the problem (less variables).

My server running 1.43.3 has been stable (Ubuntu 24.04, bare metal). Not doubting problems you’re experiencing. Just struggling to figure out why they’re occurring.

10

Did all that, yet the servers keep coming & going. Here is the full log if anyone can find out the issue.

Plex Media Server Logs_2026-08-16_11-38-36.zip (1.5 MB)

11 
(60, SSL peer certificate or SSH remote key was not OK) (SSL: no alternative certificate subject name matches target host name

In an elevated command prompt enter:

certutil -syncWithWU

With the Plex server stopped you may be forced to clear the contents of the Plex Cache directory, your path:

C:\Users\yasin\AppData\Local\Plex Media Server\Cache\

You could try just the cert-v2.p12 file to see if you get a newer cross signed file.

12

OP is using docker on linux, so I am not sure these commands will help OP.

13

That could be part of the problem, his logs are from a Windows server.

14

Did this on both windows & ubuntu server - nothing changed. Ubuntu server still comes & goes. When it shows in the windows app, there is no lag, everything runs smoothly.

15

A fresh set of logs from both servers would be helpful.

Are you torrenting or running 3rd party apps like Kometa etc on any of these servers?

At this point I suspect a network disruption occurring locally (switch/hub/cable) or the Router being overwhelmed.

16

Im also guessing its related to the switch, since that was the last change I made to my network.

So today I’ve changed from unmanaged to managed switch. Let see if this make plex more reliable.

17

You have several issues, including running a VPN.
you have a DNS issue: Aug 13, 2026 22:12:40.677 [7132] WARN - [HttpClient/HCl#109] HTTP error requesting GET https://v4.plex.tv/pms/:/ip (6, Couldn't resolve host name) (Could not resolve host: v4.plex.tv)
Some kind of permission issue: Aug 12, 2026 16:36:23.516 [43912] ERROR - [Req#7c81] Failed to delete session directory (boost::filesystem::remove_all: The request is not supported [system:50]: "C:\Users\yasin\AppData\Local\Plex Media Server\Cache\Transcode\Sessions\plex-transcode-02a7eb82-490f-469b-adad-bfb9e4f9af76-67a4f2ab-1bd0-4070-b7cf-323c01348df1\media-00066.ts")

For the SSL error I would suggest checking your system date/time and timezones are all correct.

18

I regularly turn on/off VPN but not when Im using plex. These are probably harmless network update on the log.

Plus its an issue from all my devices, even those which doesnt have VPN installed. Also the ubuntu server PC doesnt have any VPN installed. Although it runs tailscale so that I can connect from outside to other homelab apps, I dont think that will be an issue for Plex.

19

Changing the switch didnt fix it either. Here are the logs from Ubuntu server after restarting.

Plex Media Server Logs_2026-08-19_05-02-10.zip (1.6 MB)

20

The likelihood of two servers having out of date Root CA’s is small yet there it is:

(60, SSL peer certificate or SSH remote key was not OK) (SSL: no alternative certificate subject name matches target host name

Are you running a reverse proxy? Your port forward is failing for remote access. At this point it is your environment that is failing SSL connections and therefore disrupting Plex. What is acting as your firewall and are you blocking ip’s/regions.

For your Ubuntu VM to update root ca’s:

sudo apt-get update && sudo apt-get install --reinstall ca-certificates