We recently switched to Comcast and experienced the same issue - internet and WiFI worked fine but the connection to the VPN was no-go. I had an installer come out who claimed he'd never heard of the problem and assured me the TC8305C was their top-of-the-range modem and router. Eventually, after I showed him the comments on this forum, he agreed to give me a battered old modem-only product he had in the back of his van and I purchased my own router. Bingo! VPN now works. I'm peeved that I'm still being billed $7 a month for the battered old modem but if it saves multiple hours of being passed around through Comcast's customer service department, I guess it's worth it.
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