IIS AAR - URL Rewrite for reverse proxy - how to send HTTP_HOST

Question

Trying to use AAR as a reverse proxy in front of several back end IIS servers.

• One public ip address assigned to the server running IIS/AAR

Answer 1

This post has the answer - Modifying headers with IIS7 Application Request Routing

Need to enable preserveHostHeader - can't see how you do that in the UI but this works

Run this from command line to update Machine/webroot/apphost config

%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/proxy -preserveHostHeader:true /commit:apphost

Answer 2

My guess would be that your server doesn't allow you to change the server variable HTTP_HOST when you rewrite the URL.

At the level of the website where the URL rewrite is applied:

Then click the Add... link on the right tab and add your HTTP_HOST variable: