Some network configurations have tight security in place. If your church falls under that description, here is a comprehensive list of the sites you'll need to allow for Check-Ins to run smoothly.
*.planningcenteronline.com Needed for Check-ins, but other apps too, for example, Accounts for signing in, People for some modals, and API for some elements of the top bar
ws.pusherapp.com We use Pusher for live-updates and station online detection.
*.cloudfront.net Some of our assets (JS, CSS) are hosted on CloudFront
*.amazonaws.com Theme backgrounds are served from S3, part of Amazon Web Services
*.typekit.net We load web fonts from here
www.google-analytics.com: Ya know, Google analytics
fonts.googleapis.com: We load web fonts from here
pcocheck-ins.zendesk.com online help documentation
www.dymo.com for downloading Dymo software
www.zebra.com for downloading Zebra software
qz.io for downloading QZ tray, required for Zebra printing
localhost: Some ports are required for Check-Ins to connect to the user's computer:
QZ Tray: one of 8181, 8282, 8383, 8484
Dymo widget: one of 41951 - 41960