Hello All A client of mine just asked that we limit active sessions per user to 1 (e.g simultaneous use checking). Radutmp was already configured but I disabled it in favor of the checks via the SQL module. Things look to be working but I'm concerned as the radacct table has lots of (possibly old/bogus) records with no stop info that I assume will cause the check to return false negatives. We also configured checkrad and it is working. My question is this: how exactly is checkrad used? Is it used exclusively or in concert with the SQL module checks? Will I need to cleanup the radacct table or will checkrad "save" me? I have reviewed all the documents and configuration I can find but checkrad use is still a bit of a mystery to me. Bill