Hi, Sometimes I do some networking downtimes and during these periods I'm getting pretty much stale sessions in radwho output. I understand why it happens, but all I want to do is to clear them automatically, when user logs in. So what I've done is added this line: *exec("/usr/bin/radzap", "-u", $ARGV[3], "127.0.0.1", "secret");* to this part of checkrad code for mikrotik sub. #lets return something if ($username_seen > 0) { return 1; } else { exec("/usr/bin/radzap", "-u", $ARGV[3], "127.0.0.1", "secret"); return 0; } } If I understand it right, this code works like: if there is a username logged in on NAS, then we return 1, which means error, I guess? if there are none, we return 0, which is OK I guess? So I just want to clear (if there any) the stale session for user, if he's not logged in on NAS, but for some reason has stale session on freeradius server (visible in radwho) But.. nothing happens. If I execute the command from the shell, it works.. So as I'm not a programmer, I think, that I must be added this line to the wrong place of radcheck script. Any help? -- Best regards, Roman.