Hi, If your listener is up but database is down or not registered with the listener running on 1243 port and automatic instance registration is used i.e. no static SID_LIST in listener.ora file, that is exactly what you get. You are running listener on non-standard port, so you need to verify local_listener parameter is set in the CDER database. If you provide the following output it'll be much easier to pinpoint the problem - lsnrctl status <listener_name> - show parameter local_listener from CDER database --romas On 6/10/08, Shanmugam, Dhandapani <dhandapani.shanmugam@xxxxxxx> wrote: > > Hi, > > Could some one help on the below error > > F:\>tnsping CDER > > TNS Ping Utility for 32-bit Windows: Version 9.2.0.8.0 - Production on > 10-JUN-20 > 08 14:00:10 > > Copyright (c) 1997, 2006, Oracle Corporation. All rights reserved. > > Used parameter files: > c:\Oracle\network\admin\sqlnet.ora > > Used LDAP adapter to resolve the alias > Attempting to contact > (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=cder.guru.sree.com)(PORT=1243) > )(CONNECT_DATA=(SID=CDER))) > OK (60 msec) > > F:\>sqlplus test@CDER > > SQL*Plus: Release 9.2.0.8.0 - Production on Tue Jun 10 14:00:25 2008 > > Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. > > Enter password: > ERROR: > ORA-12505: TNS:listener could not resolve SID given in connect > descriptor > > -- > //www.freelists.org/webpage/oracle-l > > >