ESP packets dropped

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We're using a Windows Server 2003 machine as the firewall for our
office network. I have not configured the firewall with any outbound
filters. However, by using Ethereal to capture packets on both sides
of the firewall, I can see that ESP packets that are not tunneled are
being dropped. Does anyone know why this might happen?

If the ESP packets are tunneled through UDP or TCP, then they are not
dropped.

I discovered this after having some trouble accessing network
resources on a remote network from a machine on our office network
after connecting to the remote network using a Cisco VPN client.

I don't have any problems if I use a different firewall. For example,
I don't have any problems using a simple 8-port Netgear NAT router/
firewall.

Thanks,
Seamus

.

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