how do i setup acces to EXCHANGE 2007 CAS through isa 2006 reverse proxy

Im missing something basic Im sure: -  I have CAS exchange 2007 setup - users can get to their 2003 exch mailbox ok using this  going to https://servername/exchange. I cant or at least dont know how to get access from outside/internet to this location - with isa 2006 reverse proxy. All ports open through firewall  - my main gripe at the minute is what do i substitute  this (https://servername/exchange) with on the ISA server Exchange web client access rule - To Tab in area (this rule applies to this published site:) from the doco Ive read it says "put in what users type into a browser to get to their webmail" - but i cant put in https://servername/exchange - so im lost and feeling stupid :)  - how do i create a url or host i h\guess that does point to https://servername/exchange?  - thats the part im missing - so its either an IIS or DNS thing I guess.
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philb19Asked:
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Stephen CroftTechnical ArchitectCommented:
Morning Fella,

http://technet.microsoft.com/en-us/library/bb794751.aspx for Exchange 2007

http://technet.microsoft.com/en-us/library/bb794845.aspx for Exchange 2003.

Basically you need to let ISA deal with the logon, and back-end authenticate to your CAS servers. Both links are pretty in-depth and should cover anything you need :)
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philb19Author Commented:
thanks allot to read there - I was hoping for quick explanation of going from https://servername/exchange    to    say  https://mail.contoso.com/exchange - and how i would do this (hopefully simply)step by step -


thanks again will try and get through article
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Stephen CroftTechnical ArchitectCommented:
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philb19Author Commented:
very interesting thanks - might need to give you points - thing is i was  trying to setting up with a unihomed single nic ISA 2006 - in a workgroup in the DMZ - this article recommennds 2 nics - and to join ISA 2006 to the domain - seems insecure - but ill need to read his articles - is this the way you have set it up - ie - by joining the isa to the domain?
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Stephen CroftTechnical ArchitectCommented:
AD joining isn't that bad, as you should have a decent firewall in front of your DMZ anyway ;)

As for single nic / dual nic, I would reassess your plan and implement dual nics. In fact you will have to open up your DMZ sufficiently enough for you to be able to talk to Exchange / AD back end.

Other way of doing this is to setup a website as a simple reverse proxy for OWA, and not a "OWA Virtual Proxy". Disable IAS authentication and it should be able to present directly the OWA. Personally not  the best way to do it, but it works.
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philb19Author Commented:
great thanks - 1 thing I would like answered is in regard to dns - sorry for basic question - so the user on internet types in URL for webmail - say webmail.organization.com.au - the DNS entry for this i create should point to the ISA server in the DMZ correct ? - and from here the ISA then talks to the exchange CAS server in internal LAN - then exchange passes traffic through the ISA proxy and back to client -  Am I correct with this?

Im just a bit confused with what host record i put in dns - and How isa knows to apply the exchange pub rule ?? thanks again
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Stephen CroftTechnical ArchitectCommented:
your A record for the subdomain required should be pointed at your WAN IP that Nat's through to your DMZ (or your DMZ address if it is a "live Internet IP"
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philb19Author Commented:
Yes thats what i feared was the case - thanks. Does that mean that ALL traffic coming into our LAN will  then NAT to the ISA (DMZ interface - it is public)  -- therefore ALL traffic will go through the ISA - meaning I will need to have the correct rules to allow traffic to pass to reach say our smtp server - web server etc?
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Stephen CroftTechnical ArchitectCommented:
That depends. Do you have a router/firewall in front of your ISA?
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philb19Author Commented:
yes the PIX   - the isa is just 1 of 12 servers in dmz
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Stephen CroftTechnical ArchitectCommented:
Then you want to forward web traffic onto your ISA via your PIX. Other traffic can still NAT elsewhere :)
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philb19Author Commented:
all good dns to the isa interface - no need for any NAT - despite doco saying to do - all working without NAT - thanks for help - its important to have permissions on virtual dirs correct - all the patchs fro publishing webmail - as well as use template for single interface on an isa
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Stephen CroftTechnical ArchitectCommented:
fab thanks fro the points!
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