I am trying to minimize the failure rate for detecting a user online status using FR105 & MySQL411. Sometimes the AcctStopTime in the radacct table remains 0 even the user is not anymore online for whatever reason (reboot, connection lost or ...). I can therefore not just check if the AcctStopTime for a particular user is 0. Since there is no record when the NAS unit sent the last update to FR and it is not recorded in the radacct table ... how do I know that the AcctStopTime=0 is not a 'leftover' ... Would it make sense to add a TIMESTAMP to the radacct table to record the last update? And would the use of TIMESTAMP for the radacct table produce some form of performance degrade? A TIMESTAMP would allow me to see if the row was updated within Idle-Timeout. Any hints from experience? Thanks, Gunther