Message Oracle TNS-12509 - TNS: listener failed to redirect client to service handler

ERRORTNS: listener failed to redirect client to service handler
CAUSEThe dispatcher terminated unexpectedly
ACTIONAttempt to connect again and if the same error occurs, contact the DBA to check the state of the dispatchers for this SID. If the problem persists, turn on tracing in the listener to determine the TNS error caused by the redirect.