To create an HTTPS trunk, open the Forefront UAG Management console on your server, right-click on the HTTPS Connections branch and select New Trunk. On the wizard, select Portal Trunk, but don't check the option Publish Exchange applications via the portal, even if you plan on doing so. You will be able to launch the Exchange publishing wizard at any point, and we will discuss that in depth in Chapter 4.
On the next page, type in a name for the trunk, and the Public hostname you selected earlier. The public hostname should not include the HTTPS://
prefix. Select the public IP address that will be assigned to it, or one of them, if there's more than one. Leave the port selection fields as they are, and don't worry about the "80" one – that does not mean it will be non-secure. Be careful about selecting the trunk name – it's not visible onscreen to the end-user, but it is part of the URL that the user might notice, so make sure it's something respectable and reasonable...