I posted this yesterday with no response so I'm gonna try again. I've been getting these same 3 WebResource.axd 404 errors for over a week in my ASP.NET Web Form. I know 2 have to deal with Images and 1 has to deal with JavaScript but don't know where else to go. I've tried adding:
<add path="WebResource.axd" verb="GET" type="System.Web.Handlers.AssemblyResourceLoader" validate="True"></add>
to my handlers in web.config, but gives me a 500 error. If I put it in httphandlers, my site runs but nothing gets fixed.
I've tried embedding different images and js files and referencing them in my AssemblyInfo but no luck. I checked all of my CSS files to make sure every image is getting called correctly and there isn't any confusion. I'm seriously out of options at this point. I've taken stuff in and out of my web.config over and over, tried changing my IIS, checking all of my references, etc. etc.
Does anybody have any kind of advice or just a direction to go in?
See the answer to this question
Basically create a Failed Request rule and continue from there to see what is exactly happening.
Sometimes 500 means your web.config syntax is wrong. Try if your XML syntax is correct.