Are you trying to PPTP TO the PIX, or to a host inside it. It sort of looks like the latter, but you have configured the PIX to accept the connection with all the VPDN commands. EXactly what are you trying to do here.
If you trying to get to a server on the inside of the PIX, remove all the vpdn commands. You'll need a one-to-one static translation for that inside host translated to a valid routable external IP address (you'll need to get one assigned from your ISP). Then allow the protocols thru with an ACL which you seem to have already done. your clients will then need to connect to that valid IP address, which the PIX will forward through to the internal PPTP server.
If you're tryingto PPTP TO the PIX, then you'll at least need a "nat 0" statement so you don't nat the return traffic, although this won't solve your initial connection problem. Please follow http://www.cisco.com/warp/public/110/pptppix.html and see how you go, especially check your client settings cause it seems that they're not matched to what you've configured on the PIX (encryption strength, encryption required, etc).
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