httpsentry
HttpSentry (www. httpsentry. com) is a free IIS Filter to detect hacker attacks. It prevents common security problems such as SQL injection, Directroy traversal and many more. it also supports URL rewrite and Server masking. HttpSentry is also an effort to shift the burden of input validation... The installation comes with only one dll and one configuration file. ... A set of built in rules for detecting common invasion techniques such as Directory traversal, SQL injection, Shellcode attack, URL split, Serverside include attack, OS command execution, Buffer overflow and Code red attack.
http://geocities.com/httpsentry/httpsentry.zip - 55Kb - Download