Steps to reproduce:

• On a slow connection.

  wget http://packages.ez.no/ezpublish/5.3/5.3.0/index.xml

  Needs to take more than 3 seconds.

• Run the setup wizard
• After selecting langages for the site
• You get an error

      Error
  
      Retrieving remote site packages list failed. You may upload packages manually.
  
      Remote repository URL: http://packages.ez.no/ezpublish/5.3/5.3.0alpha1/