ORA-12547
"ORA-12547: TNS:lost contact"
Check the permissions of file $ORACLE_HOME/bin/oracle
expected: -rwsr-s--x
if not, change the permissions by chmod 6751 $ORACLE_HOME/bin/oracle
I had -rwxr-x---
And I got the error "ORA-12547: TNS:lost contact"
--
Andrey.