ORA-12224: "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.

ORA-12541: "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.