Red Hat Satellite server upgrade to version 6.10 fails with Katello::Resources::Candlepin::CandlepinPing: 404 Not Found error.

Issue

• Upgrade to Red Hat Satellite v6.10 from the previous version failed with the below error message:

All services started                                                [OK]
--------------------------------------------------------------------------------
 Reset the Pulp 2 to Pulp 3 migration data (pre-switchover):           [FAIL]
 Failed executing foreman-rake katello:pulp3_migration_reset, exit status 1:
 API controllers newer than Apipie cache! Run apipie:cache rake task to regenerate cache.
 rake aborted!
 Not all the services have been started. Check the status report above and try again.
 /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.18.1.50/lib/katello/tasks  /reimport.rake:10:in `block (2 levels) in <top (required)>'
 /opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.3/exe/rake:27:in `<top (required)>'
Tasks: TOP => katello:pulp3_migration_reset => katello:check_ping
(See full trace by running task with --trace)
{:services=>
  {:candlepin=>{:status=>"FAIL", :message=>"404 Not Found"},
   :candlepin_auth=>
    {:status=>"FAIL",
     :message=>
      "Katello::Resources::Candlepin::CandlepinPing: 404 Not Found  (GET /candlepin/status)"},
   :foreman_tasks=>{:status=>"ok", :duration_ms=>"2"},
   :katello_events=>
    {:status=>"ok", :message=>"0 Processed, 0 Failed", :duration_ms=>"0"},
   :candlepin_events=>
    {:status=>"FAIL", :message=>"Not running", :duration_ms=>"1"},
   :pulp3=>
    {:status=>"FAIL",
     :message=>
      "Not all necessary pulp workers running at https://satellite.example.com/pulp/api/v3."},
   :pulp=>{:status=>"ok", :duration_ms=>"35"},
   :pulp_auth=>{:status=>"ok", :duration_ms=>"18"}},
 :status=>"FAIL"}
--------------------------------------------------------------------------------
Scenario [Reset the Pulp 2 to Pulp 3 migration data (pre-switchover)] failed.

The following steps ended up in failing state:

  [content-migration-reset]