PLEX Media Server 1.27.0 update killed playback on CentOS 7.x X64

Server Version#:1.27.0
Player Version#: 4.76.1

Running on fully patched CentOS 7 x64 VM.

Updated from Plex 1.26.2 to 1.27.0. Web interface worked fine, full catalog was available and search able. Error occurs on all available platforms.
WIndows 10 Chrome, Edge & IE - Failed - “Conversion failed. A required codec could not be found or failed to install”

Roku 4k - Failed - to many encoding errors.

Samsung Smart TV - To Many encoding errors.

Force to roll back to 1.26.2 and restore the database to restore functionality.

DEBUG log files ZIP which captures some of these please ?

Plex Media Server Logs_2022-06-07_08-38-55.zip (2.0 MB)
FIle attached, Had to re-install 1.27.0 to get debug logs. Now I have to revert the snapshot to see if I can get it working again.

I can show you the problem right away.

Jun 07, 2022 08:30:31.326 [0x7f92c10c8b38] WARN - Codecs: Failed to download h264 decoder; bailing out
Jun 07, 2022 08:30:31.430 [0x7f92c101eb38] WARN - [HttpClient] HTTP error requesting GET https://plex.tv/media/providers?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Jun 07, 2022 08:30:31.430 [0x7f92c0da7b38] ERROR - [MediaProviderManager] Error parsing content.
Jun 07, 2022 08:30:31.435 [0x7f92c101eb38] WARN - [HttpClient] HTTP error requesting GET https://plex.tv/api/v2/server/users/services?auth_token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Jun 07, 2022 08:30:31.435 [0x7f92c0fe2b38] ERROR - MyPlex: Error -6 requesting XML from: https://plex.tv/api/v2/server/users/services?auth_token=xxxxxxxxxxxxxxxxxxxx
Jun 07, 2022 08:30:31.435 [0x7f92c0ca1b38] DEBUG - Auth: Refreshing tokens inside the token-based authentication filter.
Jun 07, 2022 08:30:31.436 [0x7f92c0ca1b38] DEBUG - HTTP requesting GET https://plex.tv/api/v2/server/access_tokens?auth_token=xxxxxxxxxxxxxxxxxxxx
Jun 07, 2022 08:30:33.736 [0x7f92c0ac8b38] DEBUG - Perfect cache hit, we don't need to start [com.plexapp.plugins.youtube] yet.
Jun 07, 2022 08:30:33.736 [0x7f92c0ac8b38] DEBUG -  * Added YouTube at /video/youtube
Jun 07, 2022 08:30:33.740 [0x7f92c0aebb38] DEBUG - Spawned plug-in com.plexapp.plugins.unsupportedappstore with PID 1882
Jun 07, 2022 08:30:33.740 [0x7f92c0aebb38] DEBUG - [com.plexapp.plugins.unsupportedappstore] Sending command: GET /:/prefixes
Jun 07, 2022 08:30:36.431 [0x7f92c10c8b38] DEBUG - Grabber: Plex Tuner Service not running; retrying in 10 seconds.
Jun 07, 2022 08:30:36.442 [0x7f92c101eb38] WARN - [HttpClient] 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)
Jun 07, 2022 08:30:36.442 [0x7f92c0fe2b38] DEBUG - MyPlex: using cached data for request for https://plex.tv/api/v2/server/access_tokens?auth_token=xxxxxxxxxxxxxxxxxxxx
Jun 07, 2022 08:30:36.443 [0x7f92c0ca1b38] DEBUG - MyPlex: updating with 16 access tokens
Jun 07, 2022 08:30:36.444 [0x7f92c0ca1b38] DEBUG - HTTP requesting GET https://plex.tv/api/v2/server/users?auth_token=xxxxxxxxxxxxxxxxxxxx
Jun 07, 2022 08:30:36.450 [0x7f92c101eb38] WARN - [HttpClient] HTTP error requesting GET https://plex.tv/media/providers?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Jun 07, 2022 08:30:36.450 [0x7f92c0da7b38] ERROR - [MediaProviderManager] Error parsing content.
Jun 07, 2022 08:30:36.450 [0x7f92c0da7b38] ERROR - [MediaProviderManager] Error parsing XML: Error parsing file.
Jun 07, 2022 08:30:36.450 [0x7f92c0da7b38] DEBUG - [MediaProviderManager] HTTP requesting GET https://plex.tv/media/providers?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx
Jun 07, 2022 08:30:38.492 [0x7f92c101eb38] WARN - [HttpClient] HTTP error requesting GET https://plex.tv/api/v2/server/users/services?auth_token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Jun 07, 2022 08:30:38.492 [0x7f92c0fe2b38] ERROR - MyPlex: Error -6 requesting XML from: https://plex.tv/api/v2/server/users/services?auth_token=xxxxxxxxxxxxxxxxxxxx
Jun 07, 2022 08:30:38.492 [0x7f92c5178b60] DEBUG - MyPlex: using cached data for request for https://plex.tv/api/v2/user?includeSubscriptions=1&includeProviders=1
Jun 07, 2022 08:30:38.496 [0x7f92c5178b60] DEBUG - MyPlex: username is jcmdconald507, login is jcmcdonald507@gmail.com, home is 1, has pin
Jun 07, 2022 08:30:38.499 [0x7f92c5178b60] DEBUG - MyPlex: start public ip check and mapping - current mapped state: 'Unknown'.

Your DNS is unstable.

Thanks ChuckPA, I had fixed the DNS problem but it still occurred. But your findings did point me to the problem. My firewall was blocking the server from getting out and downloading the client. I wasn’t aware it needed to pull it each time from the web. Upgraded to the latest release and it appears to be stable.