How to fix the Oracle error TNS-12566: TNS:protocol error?

In this post, you’ll learn more about the Oracle ErrorTNS-12566: TNS:protocol error with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12566: TNS:protocol error

Reason for the Error TNS-12566: TNS:protocol error

Cause: An unexpected TNS protocol error has occurred.

How to fix the Error TNS-12566: TNS:protocol error ?

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

Action: For further details, turn on tracing and reexecute the operation. If error persists, contact Oracle Customer Support.