How to fix the Oracle error ORA-02708: osnrntab: connect to host failed, unknown ORACLE_SID?

In this post, you’ll learn more about the Oracle ErrorORA-02708: osnrntab: connect to host failed, unknown ORACLE_SID with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-02708: osnrntab: connect to host failed, unknown ORACLE_SID

Reason for the Error ORA-02708: osnrntab: connect to host failed, unknown ORACLE_SID

The invoked Unix two-task driver failed to find an entry in oratab for the sid you supplied.

How to fix the Error ORA-02708: osnrntab: connect to host failed, unknown ORACLE_SID ?

You can fix this error in Oracle by following the below steps

First, check whether you have read access to oratab, and see if the desired sid is there. Add an entry to oratab for the desired sid, if necessary.