Last week, we renewed the certificates on our expressways, cucm and im&p. Since then Jabber can't register to the phone services from outside the network. Inside the network, jabber works fine.
We see the same with the phone service in Webex Teams. In the Teams Settings I can see I am logged in to CUCM, but the phone service says 'Phone Service disconnected'.
I ran the collab edge validator and there I got the error '407 Proxy Authentication Required'
I analysed the diagnostics logs with the TAC Tool and there I got this reply: Delegated credential checking error - There is a communication problem with the traversal client zone Traversal Zone to EWE used to receive delegated credential checking requests
I have checked the configuration of the Traversal Zone, but all seems fine. The configuration of the traversal zones hasn't been changed. Only change is the renewal of certificates. All devices have been rebooted.
Has anyone seen this behavior before and knows how to resolve this?
