Hi Mike, Now, I've compared the mySQL tables and started freeradius in debugging mode. When Coova Chilli is used, acctsessiontime is filled in the mySQL table. When NTRadping Test Utility is used, acctstarttime and acctstoptime is set correctly, but acctsessiontime is always zero in mySQL. I've found a detail-log from a portmaster [1]. I didn't know, that the NAS has to send the Acct-Session-Time with the stop-request (Newbie!). When I set Acct-Session-Time in NTRadping Test Utility it's working as expected. Is it true, that Acct-Session-Time has to be set by NAS or is it possible to calculate it by the difference between acctstarttime and acctstoptime (and write it to mySQL)? Some counters are using acctstarttime and acctstoptime directly and calculate the difference in the SQL-query when checking if time is left. Chris [1] http://www.stat.ufl.edu/system/man/portmaster/RADIUS/guide/7account.html