How to fix the Oracle error TNS-12502: TNS:listener received no CONNECT_DATA from client?

In this post, you’ll learn more about the Oracle ErrorTNS-12502: TNS:listener received no CONNECT_DATA from client with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12502: TNS:listener received no CONNECT_DATA from client

Reason for the Error TNS-12502: TNS:listener received no CONNECT_DATA from client

Cause: No CONNECT_DATA was passed to the listener.

How to fix the Error TNS-12502: TNS:listener received no CONNECT_DATA from client ?

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

Action: Check that the service name resolved from TNSNAMES.ORA has the CONNECT_DATA component of the connect descriptor.