Hello, Has anyone run into issues with the listener not starting when sqlnet.ora includes tcp node checking? It appears that the problem is a computer name that is not resolvable through DNS - or that it just happens to be turned off at the time. I am using this setting as part of a security strategy to only allow certain clients direct access to the database servers. This is happening with Oracle 10g 10.2.0.3 on Red Hat 4. The listener fails to start with message: server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:LSNRCTL for Linux: Version 10.2.0.3.0 - Production on 14-JAN-2009 13:54:23 server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:Copyright (c) 1991, 2006, Oracle. All rights reserved. server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:Starting /orapck/oracle/asm/bin/tnslsnr: please wait... server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:TNSLSNR for Linux: Version 10.2.0.3.0 - Production server:ora.server.LISTENER_server.lsnr:System parameter file is /orapck/oracle/asm/network/admin/listener.ora server:ora.server.LISTENER_server.lsnr:Log messages written to /orapck/oracle/asm/network/log/listener_server.log server:ora.server.LISTENER_server.lsnr:Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1))) server:ora.server.LISTENER_server.lsnr:Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=server-vip)(PORT=1521)(IP=FIRST))) server:ora.server.LISTENER_server.lsnr:TNS-12560: TNS:protocol adapter error server:ora.server.LISTENER_server.lsnr: TNS-00584: Valid node checking configuration error server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:Listener failed to start. See the error message(s) above... server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:LSNRCTL for Linux: Version 10.2.0.3.0 - Production on 14-JAN-2009 13:54:23 server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:Copyright (c) 1991, 2006, Oracle. All rights reserved. server:ora.server.LISTENER_server.lsnr: server:ora.server.LISTENER_server.lsnr:Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1))) server:ora.server.LISTENER_server.lsnr:TNS-12541: TNS:no listener server:ora.server.LISTENER_server.lsnr: TNS-12560: TNS:protocol adapter error server:ora.server.LISTENER_server.lsnr: TNS-00511: No listener server:ora.server.LISTENER_server.lsnr: Linux Error: 2: No such file or directory server:ora.server.LISTENER_server.lsnr:Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=server-vip)(PORT=1521)(IP=FIRST))) server:ora.server.LISTENER_server.lsnr:TNS-12541: TNS:no listener server:ora.server.LISTENER_server.lsnr: TNS-12560: TNS:protocol adapter error server:ora.server.LISTENER_server.lsnr: TNS-00511: No listener server:ora.server.LISTENER_server.lsnr: Linux Error: 111: Connection refused server:ora.server.LISTENER_server.lsnr:Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=136.224.32.132)(PORT=1521)(IP=FIRST))) server:ora.server.LISTENER_server.lsnr:TNS-12541: TNS:no listener server:ora.server.LISTENER_server.lsnr: TNS-12560: TNS:protocol adapter error server:ora.server.LISTENER_server.lsnr: TNS-00511: No listener server:ora.server.LISTENER_server.lsnr: Linux Error: 111: Connection refused CRS-0215: Could not start resource 'ora.server.LISTENER_server.lsnr'. Thanks, Julio -- //www.freelists.org/webpage/oracle-l