Random failure of Inventory Sync on Red Hat Satellite 6

Issue

• Automatic Inventory sync randomly fails on Red Hat Satellite 6 with below error

  production.log [E|bac|2f0110d4] 504 Gateway Timeout (RestClient::GatewayTimeout)
  production.log [E|bac|fc315bb8] 503 Service Unavailable (RestClient::ServiceUnavailable)
  
  or
  
  Exception:
  RestClient::Unauthorized: 401 Unauthorized