Sorry for what is most likely NOT a very intelligent question, but my non-sysadmin brain is struggling to understand what is causing my problem.

Basically, I wan't to enable reverse proxying on a IIS8 box. I read though this article:

http://www.iis.net/learn/extensions/url-rewrite-module/reverse-proxy-with-url-rewrite-v2-and-application-request-routing

And I've installed the ARR extension from here: http://www.iis.net/downloads/microsoft/application-request-routing

Now, I enabled the proxying (as explained in the MS tutorial), and I felt the other setting as they where (again, as instructed in the tutorial).

My rule looks like the following

    <rule name="Reverse Proxy to payroll" stopProcessing="true">
        <match url="^mytest/(.*)" />
        <action type="Rewrite" url="http://localhost:8282/{R:1}" />
    </rule>

But alas, it doesn't work. If I change it to a "normal" rewrite rule, as in

    <rule name="Reverse Proxy to payroll" stopProcessing="true">
        <match url="^mytest/(.*)" />
        <action type="Rewrite" url="/{R:1}" />
    </rule>

Then it works. So, it must differently be something with the reverse proxy. Any idea what gives?