PPTP is generally
regarded as poorly designed. It was one of the first,
supported by the most hardware, and does do its job
in most situations. But slow and easily blocked by home
DSL/Cable routers. PPTP uses 128 bit encryption over
'GRE' Protocol #47
PPTP users will
need to enable 'VPN Passthrough' and disable 'SPI'
or 'Stateful Packet Inspection' in their cable/dsl router in
most cases if there is a problem connecting. You can see our
general instructions on how to do this in our Knowledge Base.
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