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

In this post, you’ll learn more about the Oracle ErrorORA-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

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

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

No CONNECT_DATA was passed to the listener.

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

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

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