ORA-12547 TNS: Lost Contact

Hi All,

We are facing ORA-12547 TNS:LostContact issue after upgrading the Oracle DB from 11.2.0.3 to 11.2.0.4.

When we try to connect Database from $ORACLE_HOME/<SID>112_64 , we are facing the issue..

But, if we set the $ORACLE_HOME to /oracle/<SID>/11204 , then it is connecting fine to DB.

We have checked the all the causes mentioned in ORA-12547 TNS: Lost Contact | ORACLE DBA BLOG  and all are set correctly.All oracle environmental parameters are set properly.Oracle executable file permissions are set correctly. Eventhough we Relinked and checked. But, the issue still exists.

Could you please help on this..

Thanks & Regards,

R Gowtham Kumar.