Apple TV, cannot activate on network, but works after

Our environment is a school. We have a Sonicwall firewall and Lightspeed for content filtering. We just purchased 50 Apple TVs.
When we first turn on the Apple TV, we join it to our wireless network. Then it gets stuck on setting date and time. It gets stuck on setting date and time no matter of we are wireless or wired.
So, I broke out my Verizon MiFi and joined the TV to the Mifi. Once on my Mifi, the TV works perfectly, sets up and rocks and rolls.
Then we take it off of the Mifi and join it bac to our network and it works perfectly.
So, we only have to use the Mifi for the first boot up and initial time sync. After that, it works on our network just fine.
Of course, I'm thinking the firewall is blocking something, but I don't know what to look for. What ports does the initial activation use that it doesn't use after that? Nothing is blocked outbound, but I'm guessing there is some return traffic that never makes it to the TV in that initial activation so I need to know what it is.
Ideas? Thoughts? Suggestions?
Thanks
Cliff

This might help:
Apple TV (2nd gen.) saw my wireless network but did not accept my password (gave a network error message). It fixed instantly doing this:
Made a note of the Apple TV's MAC address. Get it by pressing Menu on the remote, then Settings > General > About. It's called "WiFi address."
Use your browser on a network connected computer to go to your router settings (usually 192.168.1.1).
Under "Wireless > Wireless MAC Filter" (or something similar) do these steps:
Enable Wireless MAC filter
Enable "Permit PCs listed below to access the wireless network"
Enter the Apple TV's MAC address
Click "Save Setting"
When I did this the network connection immediately started working.
Note: These instructions are based on a Cisco Wireless-N Broadband, model WRT160Nv2, firmware v2.0.02.

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