Parental controls ignores https?

Not sure if this is the correct group. We had setup Vista for our kids such
that only sites on the allow list were allowed. However, it appears my son
found a way around this (from school of course) by going to
https://www.vtunnel.com. Why does vista allow access to this site if it's
not on the allow list?
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Thanks,
Nick

nicknospamdu@xxxxxxxxxxxxxxxx
remove "nospam" change community. to msn.com
.