Why do I receive a warning message that my system is already registered with a different subscription management service?

Solution Verified - Updated 2022-02-25T16:14:35+00:00 -

Issue

Either of the following error messages are reported when attempting to register a system:

WARNING

You're about to register your system with the RHN Classic Entitlement Platform.
But, You're already registered with the RHN Certificate-Based Entitlement Platform.

Except for a few cases, Red Hat recommends customers only register with one Entitlement Platform

Or:

WARNING

You're about to register your system with the RHN Certificate-based Entitlement Platform.
But, You're already registered with the RHN Classic Entitlement Platform.

Environment

Red Hat Enterprise Linux 6.1 and later releases
Red Hat Enterprise Linux 5.7 and later releases
Red Hat Subscription Management

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Why do I receive a warning message that my system is already registered with a different subscription management service?

Issue

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