have you reloaded/restarted the listener after the changes in ur server. :-) -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Syed Jaffar Hussain Sent: Wednesday, March 03, 2004 3:59 PM To: oracle-l@xxxxxxxxxxxxx Subject: listener ports Hi List, I have two databases on my server. I want one of the database to listen on port 1522 instead of 1521. I have changed the parameter value in listener.ora file, but, when I try to connect from the client machine, I get the following error. I check the tnsname sid and hostname they are fine. TNS:listener could not resolve SID given in connect descriptor Rgds Jaffar