Satellite 5 is failing to synchronize with error 6001 RHN is in the process of being decommissioned and systems are no longer able to receive updates or make use of any RHN services

Issue

When trying to synchronize Satellite channels the following error message is shown:

# satellite-sync 
16:39:59 Red Hat Satellite - live synchronization
16:39:59    url: https://satellite.rhn.redhat.com
16:39:59    debug/output level: 1
16:40:00 
16:40:00 
ERROR: there was a problem synchronizing the information.
       Error message: 
Error Class Code: 6001
Error Class Info: 
     RHN is in the process of being decommissioned and systems are no longer able to receive updates or make use of any RHN services.
     Please see https://access.redhat.com/articles/2979901 for more info.