Can someone help me on the Oracle 9i AS ? I cann't access portal. I having the error message as below after I typed [url]http://hostname/pls/portal30[/url]

Proxy log On failed.
Please verify that you have specified correct connectivity information i.e.username, password & connect-string in the Database Access Descriptor
Error TimeStamp:Thu, 14 Dec 2000 08:08:08 GMT
Database Log In Failed
TNS is unable to connect to destination. Invalid TNS address supplied or destination is not listening. This error can also occur because of underlying network transport problems.
Verify that the TNS name in the connectstring entry of the DAD for this URL is valid and the database listener is running.

This error message seems like tnsnames.ora file not consistent. I guess.

Please help me on this.