Screens or tab lists show for a moment when class starts, then stop


Symptom: Chromebooks communicate with Control Tower for a brief moment after a class starts by sending screenshots or tab data, but then completely stop communicating.

This may apply if you use Lightspeed or other filters that use a proxy for and have an SSL Decryption exemption list that is blocking on port 5228.  Note that this port should already be unblocked through your firewall as described in the article: Firewall Ports for ChromeTools.

 Solution: Add to the SSL Decryption exemption list.

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