Windows Live authentication

I have setup the WebMatrix 2 StarterSite to use Windows Live authentication (OAuth) to login to my sample site but once I enter the password into windows live it redirects back to my site but the site returns a 404.7 The request filtering module is configured to deny the file extension.

Module RequestFilteringModule
Notification BeginRequest
Handler cshtml-Integrated-4.0
Error Code 0x00000000
Requested URL
http://userXXX.webmatrix2.discounta...ive&code=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Can anyone give me any pointers to fix this please?

 

Seems adding

<system.webServer>
<security>
<requestFiltering>
<fileExtensions>
<remove fileExtension=".cshtml" />
<add fileExtension=".cshtml" allowed="true" />
</fileExtensions>
</requestFiltering>
</security>
</system.webServer>
into the web.config fixed that 404.7 issue.

But now getting error System.IO.IOException: Cannot close stream until all bytes are written on
var result = OAuthWebSecurity.VerifyAuthentication();