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Sometimes, if users are switching between Wired/Wireless networks within the LAN, the users session "hangs up" and the explorer is unable to access to portal during certain time (I guess it is the expiration time).
I know the Administration console can "inmediatly expire sessions", but it does not reset the programming thread.
There are a way to admin those sessions from CLI???
Bugzilla
Wiki
Source
close zombie sessions 
Linear Mode
