What is the cause of Oracle error 12541, and what is the action to be performed to fix it?

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12541, 00000, "TNS:no listener" 
// *Cause: The connection request could not be completed because the listener
// is not running.
// *Action: Ensure that the supplied destination address matches one of
// the addresses used by the listener - compare the TNSNAMES.ORA entry with
// the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to
// go by way of an Interchange). Start the listener on the remote machine.
Start the listener using "lsnrctl start" at the command line (works for both Windows and non-Windows).

This was first published in August 2004

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