Have you checked that any firewalls are allowing the correct ports
through to Apple? The details of all ports used is here:
https://jamfnation.jamfsoftware.com/article.html?id=34 The JSS needs I
be able to connect outbound to Apple on ports 2195 and ...
AFAIK, the pulsing icon is the computer trying to find a network
bootable OS. If it's continually pulsing and not networking it can be
anything from not getting an IP address not seeing a bootable network
OS.
