Could anybody tell , I have oracle Database 8.1.6 running on NT 4.0. I don''t use OMS. I use DBA studio to access database.Everytime it doesn't happen but, if I log out and log in, I won't be able to connect.When I Install it was configured for auto startup. What I am not understanding is why it does not happen all the time,only few times then I need to reboot the machine.