Quick fix for Exchange 2013 on Windows 2012(R2) OWA Web Apps not working

Hi all,

There’s a quick fix available when your Web Apps are not working on Exchange 2013 OWA when it’s installed on Windows 2012 or Windows 2012R2.

If your Web Apps show this behaviour:
Then here’s a quick fix:
On your Exchange 2013 Frontend server find the “<exchange>FrontEnd\HttpProxy\owa” folder and open web.config in notepad.
Find “<appSettings>” and directly after that add

<add key="aspnet:UseLegacyRequestUrlGeneration" value="true" />

The result looks like this:

This tells IIS to generate “@” instead of “%40” in the urls requested by the Web Apps, which, as it turns out, is the problem when you see the behavior described above.
Save the web.config file and reload OWA

The Web Apps now work:

There is a KB in the making for this, but I’m not sure if this KB will describe this exact same action, or if this will be an update to IIS or Exchange, but in the meantime this manual fix will do the trick. I will update this post when the KB is posted.



20+ years experience in Microsoft powered environments. Enjoy automating stuff using scripts, powershell, and even batch files. In my free time (hah! as if there is any) I hunt achievements and gamerscore on anything Xbox Live enabled (Windows Mobile, Windows 8, Windows 10, Xbox 360 and Xbox One). When I'm not doing that I enjoy traveling or riding my Yamaha R1 on the edge ;)

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Posted in Exchange 2013
One comment on “Quick fix for Exchange 2013 on Windows 2012(R2) OWA Web Apps not working
  1. Brian F> says:

    Thanks. Worked great. This also fixed the problem with the icons for the apps not showing up in the ECP/Organization/Apps section. Didn’t have this problem with upgrading from Ex2013 RTM to SP1. It was only on the installs straight from SP1.

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