Unable to register the client with Red Hat Capsule server and failing with error "Service unavailable or restarting, try later"

Solution Verified - Updated -

Issue

  • Unable to register the client with capsule server.
  • subscription-manager register command is failing with below error:
[root@client.example.com]# subscription-manager register 
Registering to: capsule.example.com:8443/rhsm
Username: admin
Password: 
Service unavailable or restarting, try later
[root@client.example.com]# 

Environment

  • Red Hat Satellite 6.x
  • Red Hat Satellite Capsule 6.x

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