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IP addresses missing in External listener on ISA 2006

Last Modified: 2011-09-20

I have run into a bit of a problem publishing our Exchange 2007 server through ISA 2006 std.

The current situation is IIS SMTP on our ISA server that delievers email to Exchange.  I want to get rid of this and publish Exchange through ISA for various reasons.  However when I try and publish exchange through the wizard and following this technet article http://technet.microsoft.com/en-us/library/bb794751.aspx It goes wrong when I get to the 'Network Listener IP Address' part.  I select External and then when I get to the 'listen for requests on' screen there are no IP addresses to select.  So I tried 'All IP addresses' and applied the rule.  I disabled the access rule that sends mail to the local host and stopped the smtp service on IIS and external mail started to get bounced.  I think the problem is the lack of IP addresses in the external listener but I don't know how to add them.  Our ISA server has been working fine without them until now, OWA and autodiscover are published ok...

Can anyone help please?
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