CERT: incomplete TLS handshake: sslv3 alert certificate unknown

Plex Media Server Remote Access
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Server Version#: Version 4.12.3 (Synology native Package)
Player Version#: Android/TV

I have been having issues with a fresh Plex install and after trawling the forum have figured out that it is caused by a dodgy SSL cert

The console returns

“CERT: incomplete TLS handshake: sslv3 alert certificate unknown”

I can fix this by allowing insecure connections but what I cannot figure out is how I flush the SSL cert or reissue it.

As far as I can tell the refresh has to come from Plex supports end? ( Based on @ChuckPa manually reissuing them in other support threads ). Is that correct or can I force a new SSL cert on my end?

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Verify your Plex Media Server version. It will be 1.x, not 4.x.
Settings → Server_Name → General
or Authorized Devices

Synology model?

The Plex Media Server version provided by Synology is out of date. If you are using that version, download a current version from plex.tv and perform a manual update.

If you are running an old version of PMS, you are probably running into this problem:

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Thank you for the reply.

You are correct.

The default Synology in the package centre is 1.18. I am using DSM6. I was testing on both an Android phone + Chromecast TVs (both Android clients).

I manually updated to 1.24 from @ https://www.plex.tv/en-gb/media-server-downloads/

That has resolved the certificate issue.

(Kicking myself I missed the linked thread as I was searching around SSL/certificate issues and the error code. Hopefully if anyone else stumbles onto this thread they will at least find your solution quicker than I did!)

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