Are you connecting with a certificate or a shared key? If a certificate, look at the Cisco site for known issues with certain cable/DSL routers regarding fragmented packets and IKE
Cisco VPN client has an open issue that may apply:
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If you use the VPN Client with a Digital Certificate and your Client sits behind a Cable/DSL router or some other NAT device, you might not be able to connect to your VPN Gateway device (that is, the VPN 3000 Concentrator). The...
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