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howto configure isa 2006 single nic with exchange 2003 rpc/http

Can someone point me in the right direction in order to get this to work. I have the following setup. Isa 2006 with single nic in dmz, Exchange 2003 front-end on the inside and 2 exchange mailbox servers. I have one listener on the isa that uses FBA with AD. All services are working except the rpc.

Isa log reports the following.
RPC_IN_DATA 64 The specified network name is no longer available
RPC_OUT_DATA 503 Service Unavailable

Exchange front-end
all log entries related to rpc ends with MSRPC 200

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sbucks
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sbucks
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HayesJupeCommented:
how on earth do you expect to use ISA to forward RPC/HTTP when its only got one NIC?? your clearly using a different device to allow inbound traffic into your environment, so port forward 443 to your exchange fron end on that device.
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sbucksAuthor Commented:
Thanks for your reply, I used the following article as a guide http://www.msexchange.org/articles_tutorials/exchange-server-2007/mobility-client-access/publishing-exchange-client-access-isa-2006-complete-solution-part1.html 

In that scenario the ISA only has one nic, maybe I am missing something.
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HayesJupeCommented:
hurumph - you are correct....
i just dont understand why if your ISA 2006 isnt your edge box, why you would bother to re-direct traffic from your firewall to your ISA, so it can be re-directed to your exchange CAS. Pre-auth... and i spose ISA gives your more flexibility around your re-directs etc... but yer, i'd always make the ISA a dual homed box, give it one (or more) external IPs forwarded from the external firewall and have a full ISA config.
Looks like im missing something too - some maybe keith can advise why this is a way to go ?
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sbucksAuthor Commented:
I was able to solve my problem by disabling the http/https compression filter on the isa, also my rpcproxy/validports config on the exchange FE was not set correctly by the GUI.
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