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IISShield is an IIS ISAPI Filter preventing any known and unknown attacks from disrupting IIS. The preventive approach of IISShield is an added value preventing IIS from even trying to interpret requests trying to break-in. With a detailed logging engine, IISShield helps IIS administrators to know in advance and protect IIS from known or unknown HTTP attacks that flow over the Internet. The configuration provides the ability to precisely decide over what is accepted and what is not regarding the HTTP Layer. RFC Compliance is just one of the core features of IISShield offering an assurance of quality of service to the IIS Administrator.
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;