An issue was found with MediaCentral | Cloud UX (version 2020.4.x) where if a site is running with 3rd Party Integration when the site reboots (for maintenance or troubleshooting)
MediaCentral | Cloud UX 2020.4.x sites with 3rd Party Integrations will fail connecting to the gateway (triggered by maintenance or troubleshooting reboot) with the following error:
ERROR - unable to connect to the gateway at 'wss://clouduxserver:9900/ws': RemoteCertificateChainErrors
The details & the fix for this are here:
https://avid.secure.force.com/pkb/articles/en_US/troubleshooting/MediaCentral-Cloud-UX-2020-4-x-sites-with-3rd-Party-Integrations-will-fail-connecting-to-the-gateway