In this post, you’ll learn more about the Oracle ErrorORA-12561: TNS:unknown error with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-12561: TNS:unknown error
Reason for the Error ORA-12561: TNS:unknown error
A generic protocol error occurred.
How to fix the Error ORA-12561: TNS:unknown error ?
You can fix this error in Oracle by following the below steps
For further details, turn on tracing and reexecute the operation.