Yes, It should terminate the active session on the PAN firewall.
As per the DOC How to Clear Sessions from the Session Monitor , clearing a session from session browser is as good as clearing it from CLI ( > clear session ID xyz).
The session you have cleared from session browser, could you please verify the same from CLI also.
> show session ID xyz
Are you sure it is the same session ID?
Perhaps the client is just immediately creating a new session because the traffic still continues after the session is killed.
I have just test it in the lab. It seems like if you clear the session on 6.0.0 from the GUI/CLI it is not clearing the session. Instead the session still stays in the session table. It seems to be a bug in 6.0.0. I would recommend to open a case with Technical support so it can be filed as a bug and issue can be fixed in upcoming releases.
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