ETagFix is an add-on for Microsoft Internet Information Server (IIS) or any web server that supports ISAPI filters that cuts off part of the etag that IIS produces so that is does not change every time your computer is rebooted. ETag is an HTTP header that is produced by IIS to allow web crawlers and user clients to check against to see if a web page has changed. This fixes the problem where etags for each page change once your machine is rebooted which if not corrected can eat up more bandwidth by web crawlers crawling your web site when your web page has not changed at all. It saves you bandwidth and by clearifying to web crawlers and user browsers when the content of your web pages has actually truely changed.