Oracle Message TNS-12541 - TNS: no listener

ERRORTNS: no listener
CAUSEThe connection request could not be completed because the listener is not running.
ACTIONEnsure 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.

609332Composite note: ORA-12541/ORA-12224
396873UNIX: Error due to socket authorizations
131561Work processes sometimes abend during database connect