gPXE, sanbootconf and NDIS IM firewalls

I am having some trouble with my host based firewall when trying to
boot Windows XP from my SAN using iSCSI. I am using gPXE and I have
the Microsoft iSCSI initiator and sanbootconf installed on my system.
I then image the system and everything boots fine. However, if I try
to then add in my mandatory endpoint protection software, which
includes a firewall component implemented as an NDIS IM driver then
the boot process fails. Has anyone run into this before? I read on the
debugging page about some known incompatabilities with the Symantec
Firewall however this isn't the product I am using. Can anyone help me
identify where the incompatability might be so I can see if there is
any way my endpoint protection vendor could fix this for me?

Thanks.

Mike

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