Message Oracle TNS-00517 - Lost contact

ERRORLost contact
CAUSEPartner has unexpectedly gone away.
ACTIONInvestigate partner application for abnormal termination.

573784Work procs. terminate when started on HP/UX & Oracle 9.2.0
954896ORA-12547 connecting to sqlplus / as sysdba on AIX 5L
505630Composite SAP Note ORA-12547