Beginner Connection problem (simple maybe?)

I have two connection issues which may be related (I don't know!)

On (windows2000) The server
a) I can log onto the server as the administrator and connect to the Oracle 9i DB using the system login
b) If I log onto the server as anyone else (e.g. Domain administrator) I cannot log on to sqlplus or create a dsn (using the system login), due to the following error

	Unable to connect
	SQLState=08501
	ORA-03113: end-of-file on communication channel

From a client
 (Windows NT4, Oracle Client drivers 9.02.00.00)   If I attempt to create a DSN (using system login) to connect to the Oracle server, I get the following

	Unable to connect
	SQL State=S1000
	Ora-12545: Connect failed because target host or object does not

Does anybody have any ideas?
This is a default 9i installation, and I was not aware of any installation errors when i installed it.

Many thanks in advance, Andy Smith Received on Thu Feb 13 2003 - 17:54:49 CET