Dots in URL causes 404 with ASP.NET mvc and IIS

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I have a project that requires my URLs have dots in the path. For example I may have a URL such as www.example.com/people/michael.phelps

URLs with the dot generate a 404. My routing is fine. If I pass in michaelphelps, without the dot, then everything works. If I add the dot I get a 404 error. The sample site is running on Windows 7 with IIS8 Express. URLScan is not running.

I tried adding the following to my web.config:

<security>
  <requestFiltering allowDoubleEscaping="true"/>
</security>

Unfortunately that didn’t make a difference. I just receive a 404.0 Not Found error.

This is a MVC4 project but I don’t think that’s relevant. My routing works fine and the parameters I expect are there, until they include a dot.

What do I need to configure so I can have dots in my URL?

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