While I'm digging through MySupport, I'll toss this out here. I know I'm missing something simple Using 10.2.0.5 on Windows 2008. I created a test database. I then created a listener with a name other than listener, using the Net Manager tool. I set the password, and changed the default listening port. I installed the software and started the listener service using the Local administrator. Under this login, I can start/stop listener using lsnrctl. Works fine. Security = Password or Local OS authentication. So, I log in as a different user who has no Admin privledges and is not in the ora-dba group. I access lsnctl and try to do listener functions. No dice. Get the error message about not authorized. A good thing. Then, I issue the set_password command and set password to the listener password. I can successfully stop the listener. However, I cannot restart it. No amount of effort can get it to restart. I get TNS-12560 and TNS-00530 errors about protocol. So, the question is, what am I missing. I understand that if I turn the Local OS Authentication off, the password operations should work. But, why is it that I can set the password and stop the listener, but now can't set the password and start the listener. Thanks Bob