Uploading Large files under IIS6.0
For IIS6.0 users, the AspMaxRequestEntityAllowed property specifies the maximum number of bytes allowed in the entity body of an ASP request. If a Content-Length header is present and specifies an amount of data greater than the value of AspMaxRequestEntityAllowed, IIS returns a 403 error response. This property is related in function to MaxRequestEntityAllowed, but is specific to ASP request. Whereas you might set the MaxRequestEntityAllowed property to 1 MB at the general World Wide Web Publishing Service (WWW Service) level, you may choose to set AspMaxRequestEntityAllowed to a lower value, if you know that your specific ASP applications handle a smaller amount of data.
Open your MetaBase.XML which is located in c:\Windows\System32\Inetsrv find the line “AspMaxRequestEntityAllowed” and change it to “1073741824”.
Before editing Metabase.xml, you need to make this file editable through inetmgr. go to the IIS control panel, right click the server, select properties, and check off the box that says “allow changes to MetaBase configuration while IIS is running”.
Now open the file c:\Windows\System32\Inetsrv\Metabase.xml in Notepad and find
Doing this will allow you to upload upto 4000 KB.