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    3. 2012
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    Problems with WebServices after upgrade from .Net 3.5 to 4.0?

    <p>When upgrading a project from .Net 3.5 to 4.0, it seems the ScriptHandlerFactory entry is removed from the &lt;handlers&gt; section in Web.config. Here's how to solve this problem.</p>

    By Anders Murel

    I have several WebServices which I call from JS with JSON format. This worked perfectly fine when I was running in local Visual Studio web server (Cassini), but with IIS 7.5 on the test server,  I got this error:

    System.InvalidOperationException: Request format is invalid: application/json; charset=utf-8

    The solution is to add:

    <add name="ScriptHandlerFactory" verb="*" path="*.asmx"
    type="System.Web.Script.Services.ScriptHandlerFactory" />

    to the <handlers>-section in Web.config.