Apart from the question whether the PIX config is correct or not, please check whether in the 1720 router traffic for UDP port 4500 is open. This is a must if using NAT traversal.
Had the same problem with my PIX515E and router.
PindaRinda
After examining the debug outputs from the Firewall I conclude that the Firewall is not pushing the DNS and WINS addresses (and other parameters) to the VPN client. The IOS is 6.3.(3).
Does anybody know of this (bug?) ?
My PIX515E is configured to accept VPN connections from the Internet (option NAT T enabled). The clients are installed with the Cisco VPN client v4.0.3(A).
After setting up the connection in a simulated environment
the (transparent)tunnel comes up fine. From the client I am able to ping to IP...
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