I know this is an old post, but figured this might be useful to others:The error message was "uccx.example.com" has requested that you identify yourself with certificate: blah blah blahI had a TAC case open for this and this resolved the issue:*note:...

@Roger Kallberg I was letting him discover that in the documents. DJ

Have a look in the admin guide of a supported version that you'd want to run.  The next issue you will have is getting your hands on current versions.  Cisco used to be pretty good about leaving documentation published for deprecated versions, but no...