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ISAPI Filters offer a way of managing (changing, altering, customizing) some of the core parts of IIS. Customizing the "Server" response header is one of those tasks. While altering the "Server" response header may be useful at a security prespective by disguising the web server banner (security by obscurity), keep in mind that there are much more powerfull ways of detecting a server type using tools like nmap. IISBanner is an IIS ISAPI Filter that can be used to specify a replacement for IIS's built in "Server" header, or even to instruct IIS to not use the "Server" response header altogether. The configuration is made by an .ini file, namely "IISBanner.ini". This configuration file must reside in the same directory of IISBanner.dll.
Notes: Instalation of this ISAPI Filter must be done at the WebServer level; The ISAPI runs at low priority; IIS's performance is NOT affected by this ISAPI Filter. Any stress test will reveal that the number of HTTP requests remains unaffected with or without IISBanner;