Many of the Pugpig Modules rely on external services. If you need to set up your firewall to allow this, the details are below.
Note: The Drupal and WordPress packager does CURL to itself to generate all the items for the ZIP.
Urban Airship Push Notifications
iTunes Receipt Validation
Amazon Receipt Validation
Cloudfront Invalidation Requests
Other subscription systems
The subscription modules will often talk to your subscription system.