Some search engines, like Yahoo, use automated processes to detect soft 404s. Soft 404s can occur as a result of configuration errors when using certain HTTP server software, for example with There is risk however: responseMode="File" (which is the default) allows you to specify every file on the disk. If you add the following line to the httpErrors configuration section, IIS returns 404_3.htm if a file with a file extension is requested that is not included in the IIS MimeMap They help you to troubleshoot problems without compromising the security of your IIS Server. have a peek here
If you want to show your visitors or users a nice custom message depending on these subcode, you could do it. Browse other questions tagged custom-error-pages http-error or ask your own question. This indicates a problem with NTFS permissions. I have added a folder with a page in it in the \inetpub\wwwroot directory. https://support.microsoft.com/en-us/kb/943891
Compression Disabled. Yahoo Ysearch Help page. For instance, you can redirect all your errors to a central location that you closely monitor. You can configure the httpErrors section to show a Custom Error for particular sub-status codes.
It generates the path for the custom error using the following logic: prefixLanguageFilePath configuration setting (for example c:\inetpub\custerr)+ Accept-Language header sent by the client (for example en-us) + Path configuration setting Search Engine Land. By default in IIS 6, they are daily. Sc-win32-status Create a file named test.yyy in you c:\inetpub\wwwroot directory.
Now IIS executes /404.aspx whenever a 404 error occurs.