IIS 7.5 Can't open Handler Mappings?

asp.net iis web-config handler iis-7.5
DaveDev picture DaveDev · Sep 13, 2010 · Viewed 23.5k times · Source

I need to update the handler mappings on IIS 7.5 to allow URLs that don't have extensions to be routed to an application. The application was originally written in ASP.NET 2.0, but then later upgraded to ASP.NET 3.5. I don't know if that has relevance, but I've had no problem updating handler mappings for other .net 3.5 apps before. I should also note that this works fine on IIS 6.0

This is the error message I get when I click the Handler Mappings link in IIS 7.5 (notice there isn't really an error message as such, which would be helpful):

Handler Mappings

There was an error while performing this operation.

Details:

Filename: \?\D:\path\to\web.config

Error:

OK

Has anyone seen this before? If you need more info, let me know and I'll supply. Thanks.

Answer

chillfire picture chillfire · Jul 31, 2012

I was having the same issue, it turns out the project used the IIS URL rewrite module (not installed by default). After I installed this, the site worked first time.

Check your web.config file (especially if it doesn't open in IIS) for any non default IIS modules.

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