@dan.kubley showed me this to test if the firewall for your jamf PRO server is configured correctly:
/bin/nc -z gateway.push.apple.com 2195
/bin/nc -z feedback.push.apple.com 2196
/bin/nc -z mdmenrollment.apple.com 443
/bin/nc -z vpp.itunes.apple.com 443
/bin/nc -z jamf-patch.jamfcloud.com 443
/bin/curl http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/wa/wsSearch?term=birds&entity=software&&country=us
