How to fix the Oracle error RMAN-06403: could not obtain a fully authorized session?

In this post, you’ll learn more about the Oracle ErrorRMAN-06403: could not obtain a fully authorized session with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

RMAN-06403: could not obtain a fully authorized session

Reason for the Error RMAN-06403: could not obtain a fully authorized session

The most likely cause of this error is that one of the databases to which RMAN had previously connected is not started or has has been shutdown. Other error messages should identify exactly which database is the problem.

How to fix the Error RMAN-06403: could not obtain a fully authorized session ?

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

Startup the database causing the problem.