How to fix the Oracle error ORA-28578: protocol error during callback from an external procedure?

In this post, you’ll learn more about the Oracle ErrorORA-28578: protocol error during callback from an external procedure with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-28578: protocol error during callback from an external procedure

Reason for the Error ORA-28578: protocol error during callback from an external procedure

An internal protocol error occurred while trying to execute a callback to the Oracle server from the user’s 3GL routine.

How to fix the Error ORA-28578: protocol error during callback from an external procedure ?

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

Contact Oracle customer support.