Hi I'm using Coova and Freeradius and I have the entry below to clear stale sessions when a user logs in. I'm using freeradius version 2.1.10 and I got the code below from a previous email in this list. if(User-Name){ if("%{sql:UPDATE radacct set AcctStopTime=ADDDATE(AcctStartTime,INTERVAL AcctSessionTime SECOND), AcctTerminateCause='Clear-Stale Session' WHERE UserName='%{User-Name}' and CallingStationId='%{Calling-Station-Id}' and AcctStopTime is NULL}"){ reject } } The code above works perfectly for normal users signing in by clearing the stale session on the first attempt and the user tries again and can log in. My problem is when it's a mac auth request Coova sends the request at least twice. This causes the device to log in on the first request and then out on the second request. So how could I change the empty if statement "if(User-Name)" to only run this if the the username is not a mac address "if(User-Name != macaddress)"