Gitlab repository failed to sync on Red Hat Satellite 6.x

Issue

• Gitlab repository failed to sync on Red Hat Satellite 6.x
• Synchronization of an external rpm repository fails

• Cannot sync gitlab repo from Satellite 6, it fails with:

  Failed to download 220 packages.
  
  Errors:
  
  An error occurred during the sync 
  {"url"=>"http://packages.gitlab.com/gitlab/gitlab-ce/el/7/x86_64/gitlab-ce-7.10.1~omnibus.2-1.x86_64.rpm", "errors"=>["A connection error occurred"]}