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Can't watch TIVO as of today

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Can't watch TIVO as of today

I've used Tivo for a few years, and all of a sudden, today I can no longer access it.  For network diagnostics, it said I need to enable Port 37 & I called Comcast, but that didn't work.

Called Comcast again and someone said upgrading to Xb6 Gateway would fix it, but I have my doubts on that.

Anyone know why I now can't access Tivo and what Comcast can do?