We tried most/all of the suggestions here - thanks - and someone's suggestion to reduce MTU size, but nothing had an effect. In an attempt to generate outgoing traffic, we found a way to easily browse to thousands of webs (Chrome extension + list of top 1M sites); it sort of worked but mostly we just locked up laptops. Comcast tier 2 tech could have been more helpful. Anyway, we bailed, cancelling this service; so we'll never know why...
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