Below are my configuration files (listner.ora,sqlnet.ora and tnsnames.ora) My domain name has been altered for my protection.
I am running Ubuntu 12.04 LTS and have installed Oracle 11gR2 which was working.
While trying to sort out another problem wiith database links between this database and another 11gR2 installed on Windows XP Sp3 I have messed up and now find I can't get access to Enterprise manager.
I can connect
SQL*Plus: Release 184.108.40.206.0 Production on Mon Nov 26 14:52:23 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Oracle Database 11g Enterprise Edition Release 220.127.116.11.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
but the database control page of the enterprise manager reports
LSNRCTL for Linux: Version 18.104.22.168.0 - Production on 26-NOV-2012 14:54:48
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=freds-server.i-surname.co.uk)(PORT=1521)))
STATUS of the LISTENER
Version TNSLSNR for Linux: Version 22.214.171.124.0 - Production
Start Date 26-NOV-2012 14:31:47
Uptime 0 days 0 hr. 23 min. 0 sec
Trace Level off
Security ON: Local OS Authentication
Listener Parameter File /opt/oracle/11g/network/admin/listener.ora
Listener Log File /opt/oracle/diag/tnslsnr/freds-server/listener/alert/log.xml
Listening Endpoints Summary...
Service "GWORCL.i-surname.co.uk" has 2 instance(s). Instance "GWORCL", status UNKNOWN, has 1 handler(s) for this service... Instance "GWORCL", status READY, has 1 handler(s) for this service...
Service "GWORCLXDB.i-surname.co.uk" has 1 instance(s).
Instance "GWORCL", status READY, has 1 handler(s) for this service...
The command completed successfully