Plex Breaks SMB?

Plex Media Server
1

Server Version: 1.26.2.5797
OS: Windows 10

I’m having an issue when Plex server is running I’m unable to access SMB shares on my unraid server.

If plex is not running I can access all shares, copy files to/from, etc. If I start a file transfer and launch Plex after about 10 seconds the file transfer will fail. At that point I can no longer access any of the shares on Unraid. When I lose access it’s only to the SMB shares. I can still ping the Unraid server and login to the webui.

Things I’ve tried:
Rollback to previous version
Disable remote access
Disable Plex relay option
Changed all my libraries to point to a local folder

Anything else I can try?

2

This was fixed by rolling back 2 versions to 1.26.1.5772.

3

I spoke too soon. I accidentally left automatic updates enabled which installed the latest version and broke SMB again. I tried rolling back to 1.26.1.5772 again but SMB remains broken… :frowning:

4

That’s weird.

This is with Plex Media Server running on the Windows machine, correct?

And it refers to SMB shares from the Unraid server?

It might be useful to share server logs.

Do you have any 3rd-party antivirus or security running, on either the Windows system or Unraid? I wonder if it’s getting backlogged when PMS scans for files.

5

Plex Media Server Logs_2022-05-25_13-45-44.zip (2.4 MB)

So for this example I:

  1. Stopped PMS
  2. Confirmed I can access the SMB share
  3. Start Plex
  4. Refreshed SMB share a few times and less than a minute after starting PMS the refresh failed and I cannot access any SMB shares to the Unraid server.
  5. Pulled logs from UI
6

The Plex logs agree - Plex is scanning media and files, and then the drive becomes unavailable.

Do you have any 3rd-party antivirus or security software running, on either the Windows system or Unraid?

If it isn’t something like that, you may need an Unraid expert to make suggestions. Plex makes a large number of filesystem requests, but nothing that should cause a fileserver to stop responding.

7

No 3rd party antivirus.

8

So theoretically if I change the path to all my libraries to a dummy local folder then Plex should stop all communications with unraid, right? As a test I did this. Then I closed PMS, waited for SMB to work again and launched PMS. Once again I lost access to Unraid shares even though I removed all Unraid SMB locations from my library configuration. Attached are new logs.
Plex Media Server Logs_2022-05-25_22-10-08.zip (2.8 MB)

9

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