About skype: how to know, when users realy use skype and when PA detects only false positive? Because now i have lot of log with "secure.skype.com" URL and PA detects it as skype application.. I would be grateful for an explanation.
The URL log as below is generated by accessing to secure.skype.com from IE10.
Do you mean you can't figure out this is actual skype session or just https session from browser?
If my understanding is correct, I guess there is no clue to figure out which pattern is it because the session is encrypted by ssl and PaloAlto device could not see the payload.
However, skype client send out skype-probe session, if you can see skype and skype-probe from one source address, you might be able to say that user is using skype client.
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