How to fix the Oracle error TNS-12666: Dedicated server: outbound transport protocol different from inbound?

In this post, you’ll learn more about the Oracle ErrorTNS-12666: Dedicated server: outbound transport protocol different from inbound with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12666: Dedicated server: outbound transport protocol different from inbound

Reason for the Error TNS-12666: Dedicated server: outbound transport protocol different from inbound

Cause: The protocol specified for an externally-identified outbound connection from a dedicated server (database link) was not the same as that used for the inbound connection. It is not possible for Oracle Net to authenticate a proxy connection that uses a protocol that is different from that which was used for the connection to the dedicated server.

How to fix the Error TNS-12666: Dedicated server: outbound transport protocol different from inbound ?

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

Action: Specify the same protocol in the Oracle Net connect descriptor for the outbound connection as that used for the inbound connection.