Cannot register to RHN / Subscription Manager due to certificate issues

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Issue

When trying to register using RHN Classic, the following error is displayed:

A security certificate compatible with https://xmlrpc.rhn.redhat.com/XMLRPC was not found on this system

When trying to register using subscription-manager:

CA certificate for subscription service has not been installed

Environment

Red Hat Enterprise Linux
RHN Classic
Red Hat Subscription Managment

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