Why the message "A subscription-activating installation number was found on disk, but we were not able to activate it" while registering to RHN?

Solution Verified - Updated -

Issue

What is the meaning of the following message while registering to RHN ?

A subscription-activating
installation number was found on disk, but we were not able to activate
it (An unknown error occurred.) We used existing active subscription
slots available in the rhn account instead. You may wish to contact Red
Hat customer service regarding this issue:
http://www.redhat.com/apps/support/

Environment

  • Red Hat Network Hosted
  • Red Hat Enterprise Linux 5

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