How to fix the Oracle error CLSGN-00117: Authentication protocol failure.?

In this post, you’ll learn more about the Oracle ErrorCLSGN-00117: Authentication protocol failure. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

CLSGN-00117: Authentication protocol failure.

Reason for the Error CLSGN-00117: Authentication protocol failure.

The client program did not send to the server the data in the format that it was expecting.

How to fix the Error CLSGN-00117: Authentication protocol failure. ?

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

Try the connection again using an Oracle-approved client.