I am able to connect to the instance from sql client, so listner is up, still why am receiving error in my alert log. The OS level write permission/space are already checked and no issues in it.. there is no hangup session, lock observed from oem10g what could be the issue Errors in file /usr/oracle/admin/WHSE/bdump/whse1_arc0_30929.trc: ORA-12541: TNS:no listener Wed Aug 22 11:24:40 2007 Errors in file /usr/oracle/admin/WHSE/bdump/whse1_arc0_30929.trc: ORA-12541: TNS:no listener Wed Aug 22 11:30:40 2007 Errors in file /usr/oracle/admin/WHSE/bdump/whse1_arc0_30929.trc: ORA-12541: TNS:no listener 5, 50, 500, 5000 - Store N number of mails in your inbox. Go to http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html