Scenario: Recently changed our ISP provider; reconfiguring the Firewall/Router (SnapGear 720) to enable incoming and outgoing access to go through this properly. In my network I have a Email Firewall/Filter running on my Domain Controller (Win Server 2008 R2) and this pushes the email to my Exchange 2010 (runs virtually on the DC).
So I have a NAT setup to forward incoming emails to my DC, the filter/firewall in turn pushes it to Exchange. This works great. Where my problem arises is when I attempt to connect to OWA. My NAT pushes me forward to the IIS config on my DC; obviously not the Exchange IIS.
I can switch the NAT to point to my Exchange box and get full use out of OWA, however this makes OWA trips up my incoming email to Exchange.
My question is: How could I make my router/firewall continue doing NAT on the Email while also incorporating NAT on OWA. My first thought is to create a new NAT/Foward for OWA, however I think I've been unable to figure out exactly what ports OWA requires/uses.
Any help would be greatly appreciated (PS, my router/firewall manufacter has been purchased by McAfee and has been zero help). This will really cap off my Turkey weekend!!!! Thanks! Below is a picture of the port setup I've been attempting to use.