I have set up a new web server on Microsoft Server 2003 with PHP and MySQL at the request of our web designer. I do not have much experience with PHP and when the web designer posted the new site he attempted to test it with a PHP info page. The page would fail with a 404 page not found error. I added some extensions and allowed them including the full path to php5isapi.dll. nothing worked until I allowed all unknown ISAPI Extensions. I do not want to leave all extensions allowed for security reasons, but I cannot seem to isolate the correct combination of extensions for the page to display without it.