In this post, you’ll learn more about the Oracle ErrorORA-12566: TNS:protocol error with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-12566: TNS:protocol error
Reason for the Error ORA-12566: TNS:protocol error
An unexpected TNS protocol error has occurred.
How to fix the Error ORA-12566: TNS:protocol error ?
You can fix this error in Oracle by following the below steps
For further details, turn on tracing and reexecute the operation. If error persists, contact Oracle Customer Support.