Trying to use RHSM to register the system but received a warning that system is already registered with RHN Classic

Solution Verified - Updated -

Issue

  • Trying to use RHSM to register the system but received a warning that system is already registered with RHN Classic
# subscription-manager register 
WARNING This system has already been registered to Red Hat through RHN Classic. The tool used is trying to re-register by technology Manager Red Hat subscription. Red Hat recommends that users register once.

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • RHSM
  • subscription-manager
  • RHN Classic

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