Could Not Load All ISAPI Filter For Site
November 20th, 2009 | Published in ASP.NET
In IIS 7, should you get this message, you are quite possibly dealing with an error in your web.config file(s). One way to know for sure is to set up your application under the Default Web Site (if you can) and try and view it from there. It will give you a more specific error if its under a site that can in fact be started. Its probably a syntax error like a missing tag or something of that nature.
There are other reasons for receiving this error as well. Here are some additional links regarding this error…
http://forums.iis.net/t/1149051.aspx
http://www.eggheadcafe.com/software/aspnet/31530837/iis7-support-for-isapi-fi.aspx