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    Allow PPTP through Cisco ASA

    By default clients inside a network protected by a Cisco ASA cannot dial up with an PPTP connection.
    But if you add this to the configuation it can.

    class-map inspection_default
    match default-inspection-traffic
    policy-map global_policy
    class inspection_default
    inspect pptp
    service-policy global_policy global

    PPTP uses IP protocol 47 (General Routing Encapsulation / GRE) for data.
    Allowing connections to be established – port 1723