Still can't solve the problem. External script fired according to acct_users file stays in <defunct> state for every call.
acct_users file: DEFAULT Acct-Status-Type == Stop Exec-Program = "/usr/local/sbin/testacct.php" My conf: Debian Linux 3.0 Freeradius: 1.0.4 - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html