This is an exact match of
ORA-12547 connecting to sqlplus / as sysdba on IBM AIX 5L [ID 372143.1]
Basically because the /proc is not mounted on your server.
/DB/../10204-64/network/admin PROD 341 >sqlplus / as sysdba
/usr/bin/procmap : no such process : 373080
/usr/bin/procmap : no such process : 373080
/usr/bin/procmap : no such process : 373080
SQL*Plus: Release 10.2.0.4.0 - Production on Tue Sep 28 15:39:02 2010
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ERROR:
ORA-12547: TNS:lost contact
