How to fix the Oracle error TNS-00551: underlying transport connection failed?

In this post, you’ll learn more about the Oracle ErrorTNS-00551: underlying transport connection failed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-00551: underlying transport connection failed

Reason for the Error TNS-00551: underlying transport connection failed

Cause: The underlying transport adapter used by the SSL adapter failed to connect.

How to fix the Error TNS-00551: underlying transport connection failed ?

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

Action: Enable Oracle Net tracing and try the connection again. If the connection fails, examine the trace file to determine the cause.