: Clients requesting garbled URLs I've noticed some odd 404s which appear to be broken URL rewriting code. Our image viewer requests tiles using URLs like this: /media/204/service/dzi/1/1_files/7/0_0.jpg

@Ann8826881

Sometimes people will change URLs to see how your site responds. I've done this with several sites where I needed high-resolution reference imagery and figured that the site was scaling the images based on the REQUEST_URI. Sometimes (depending on the library being used) you can change things like dimensions, directories, and aspect ratios to get error messages (to tell you what someone is running on their server) and you can get larger (unscaled images).

Most sites that use the image scaling software do it for increasing the page optimization, and most users tend to upload images that are not scaled [down] from their original digital camera (sometimes now up to 24 mega pixels).

Another (more likely) possibility

Since the IPs are from all over the world, there may be a known issue with the software you're using and they're (using a botnet) trying to execute an exploit for a non-patched version.

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@Merenda212

I believe that those are DZI (Deep Zoom Image) requests.
Does your app deal with maps? Most Likely Silverlight?

You are getting that because one of the collection images is missing or the DZI collection si not defined correctly.
msdn.microsoft.com/en-us/library/cc645022(v=vs.95).aspx

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