Repository sync fails with the error 'Katello::Errors::Pulp3Error: Cannot connect to host proxy.example.com:8080 ssl:default'

Issue

• HTTPS proxy is configured on the Satellite server and in /etc/rhsm/rhsm.con.
• Manifest refresh completed successfully.
• But the sync fails with the below error.

"description"=>
       "Cannot connect to host proxy.example.com:8080 ssl:default [None]"},
    "worker"=>"/pulp/api/v3/workers/8741e5c4-b56c-4279-bd3e-f3d0e09ebdeb/",
    "child_tasks"=>[],
    "progress_reports"=>[],
    "created_resources"=>[],
    "reserved_resources_record"=>
     ["/pulp/api/v3/repositories/rpm/rpm/98fcefdd-4a0e-4dbf-9b1f-765360801252/",
      "shared:/pulp/api/v3/remotes/rpm/rpm/3b69810c-24d8-480b-bfbe-0f925a7d20bd/"]}],
 "create_version"=>true,
 "task_groups"=>[],
 "poll_attempts"=>{"total"=>13, "failed"=>1}}

Exception:

Katello::Errors::Pulp3Error: Cannot connect to host proxy.example.com:8080 ssl:default [None]

Backtrace: