AJAX Control Toolkit – ScriptResource.axd: Failed to load resource

Recently I’ve deployed one of my ASP.Net projects to a shared host, and found that AJAX Control Toolkit stopped working. No errors or exceptions visible on screen, but control extensions just stopped functioning.

I did some debugging and found that it was coming up with an error –

ScriptResource.axd: Failed to load resource: the server responded with status of 404 (not found) .

Solution is to add a handler in web.config, under <system.webserver>.

<add name="ScriptResource" preCondition="integratedMode" 
verb="GET,HEAD" path="ScriptResource.axd"
 type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, 
Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />

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