Although I am not a “Security Professional” by any stretch of the imagination, I have like many developers, servers that are Internet-facing. I was on a search for a free utility that would let me restrict the types of request to one of my Web Server boxes, and stumbled upon this free utility by Microsoft, and most importantly for me, they offer a 32bit and a 64bit (I have both installation bases).
Here’s the overview of the utility (from the site):
UrlScan version 3.0 Beta is a security tool that restricts the types of HTTP requests that Internet Information Services (IIS) will process. By blocking specific HTTP requests, UrlScan helps prevent potentially harmful requests from being processed by web applications on the server.
Here are the download links:
Enjoy,
~Robert Shelton

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