I am facing problem of Ending - blocked of user status.
this is a strange behaviour.This is because AX locks the user session when there was a problem in prosessing the transaction and if you see the online users some of them would have been locked for the past few days. You can go to
Sql Server > Dynamics AX database > SysClientsessions and find the session id from the online user form and delete the record. Now if you go back to the online user list , you should see the user session has been deleted.