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Handler error while running ASP.Net web application

If you are getting invalid handler error while running IIS application on local IIS, chances are that you have installed IIS after you installed .Net framework/Visual Studio.

The problem is basically IIS by default is not configured to handle ASP.Net files. When you install the Framework, it configures IIS to handle all files for ASP.Net i.e files with extension .aspx, .asmx, .ascx etc.

So to fix the error, login as local administrator on your machine. Go to Visual Studio command prompt from Program files. On the command prompt execute following command

aspnet_regiis -i

Wait for successful installation.

Now try again running your application under IIS. This should solve the problem.

More information about aspnet_regiis can be found at
http://msdn.microsoft.com/en-us/library/k6h9cz8h%28v=VS.100%29.aspx

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