Mark,

Your firewall shouldn't have any problems with keeping a state table open for the ISAKMP trsaffic but I have noticed that a lot firewalls do not keep a state table open for non-TCP or UDP traffic.  I have not worked with the PIX in a few years so maybe they do that now.  I would check the IPSEC logs on the PIX that the VPN is being established with too.  I remember they were pretty detailed.

Regards,
Jeffery Gieser

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