Mark,
Below are the ports that protocols that needs to be configured for Pix and VPN Client.
ISAKMP - UDP 500
ESP - Protocol 50
IPSEC Over UDP - UDP 4500 (Default)
IPSEC Over TCP - TCP 10000 (Default) - This
value is configurable and depends on what is Configured on the VPN Headend Device.
Let me know if it helps.
Regards,
Arul