I have a 3030 concentrator that I am trying to connect to with a Win2K client using IPSec/L2TP. The L2TP piece works independantly, but I am having issues with IPSec. When I sniff the traffic, I see the client send ISAKMP packets to the concentrator, and the concentrator simply replies with ICMP type 11 packets. I have all debugging turned on on the concentrator, but nothing shows up in it's log. I followed the directions for preshared keys from several Cisco docs, but I am making no progress.
http://www.cisco.com/en/US/customer/products/hw/vpndevc/ps2284/products_configuration_example09186a0080094aca.shtml
There is only a private routed network between the client and concentrator, and no filters.
