Help Regarding Freeradius Server Inactivity and client access

Hello All, I have working Freeradius(freeradius-2.1.3-1.fc10.i386) server with Mysql and chillispot. I just want to know what should happen when user is authenticated and after few time freeradius server stops working(due to any reason). In my case user stays on-line even though freeradius server is not working. For e.g. user A connects to my network radius server authenticates to user and after authentication say after 5 minutes radius server stopped working but user A still accessing internet as long as possible. I think if server stops working client should be disconnected. Regards, Pushpraj N.