Hosts or Participants unable to Join Webex Session

[patrickbeaird]

Some of our users are encountering a couple of different popups when attempting join or start a Webex session. They are encountering a Revocation popup Or they are encountering a message that says “We’re having a problem connecting to the Webex Meetings service. Check your network connection try again.” When encountering the Revocation popup some are able to click Yes and the popup by come back several times but they are eventually able to join the session.  Others are unable to join regardless.  If users encounter “We’re having a problem connecting to the Webex Meetings service. Check your network connection try again.” they are unable to join unless they go to our Webex portal and use the Web App (instead of the Desktop app) to access the session. 

[Stephanie Knoop]

You may wish to check the guidance in this document:
https://help.webex.com/en-US/article/WBX72097/Error:-'Revocation-information-for-the-security-certificate-for-this-site-is-not-available.'-when-Accessing-a-Webex-Site

Additionally, you may need to take some steps outlined here:
https://help.webex.com/en-US/article/WBX9000034330/New-Root-Certificate-Authority-for-Cisco-Webex-Services-from-March-2021
Related, but maybe not what you are experiencing is a need to update the trusted CAs in Expressway:
https://help.webex.com/en-US/article/WBX87312/What-Certificates-Do-I-Need-for-a-TLS-Connection-to-Cisco-Webex-Video-Platform-Meetings?