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

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

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

 Solution: Add mtalk.google.com:5228 to the SSL Decryption exemption list.

 

 

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