CUCM Connection to the Server cannot be established(Certificate Exception)

Are you facing issue with Cisco Unified Communication Manager giving you error “Connection to the Server cannot be established(Certificate Exception)” after a DRF Restore? If yes, then you have to follow the below steps in order to resolve the issue.

• Login to Cisco Unified Communication Manager Platform GUI > https://x.x.x.x/cmplatform
• Go to Security > Certificate Management > Click on Find
• Verify if “tomcat.pem” certificate has been expired. If yes, the click on tomcat link and Regenerate the certificate. Validate the certificate in Publishers and Subscribers and regenerate wherever certificate expired.

•  Restart Cisco Tomcat Service by Logging into Publishers/Subscribers CLI on which Certificates were regenerated by running the command “utils service restart Cisco Tomcat”
• Try to access Service Pages Nodes from Publisher and the subscriber nodes should be accessible. If not, try rebooting the cluster.

Hope this helps!!

Avinash Karnani

I am working in an IT company and having 10+ years of experience into Cisco IP Telephony and Contact Center. I have worked on products like CUCM, CUC, UCCX, CME/CUE, IM&P, Voice Gateways, VG224, Gatekeepers, Attendant Console, Expressway, Mediasense, Asterisk, Microsoft Teams, Zoom etc. I am not an expert but i keep exploring whenever and wherever i can and share whatever i know. You can visit my LinkedIn profile by clicking on the icon below.

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