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ORA-12541 error on RHEL AS3 running Oracle 10g

I have installed Oracle 10g on RHEL AS 3. When I try to connect to the database using the OEM console it says, "ORA-12541:TNS no listener." How can I make it work?
The ORA-12541 error is telling you that the listener is not running. You can configure, create, and start/stop the listener all through Oracle's GUI tool, the Net Manager. On Linux, this utility is in $ORACLE_HOME/bin/netmgr.

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