iis post size limit
Large File Upload in IIS Large File Upload in IIS. By default, IIS web server allows for limited file size to be uploaded to the web server. For IIS 6 and IIS 7, the default maximum file upload size is 4 MB and 28.6 MB respectively. IIS 7 returns a 404 error (HTTP Error 404.13 - CONTENT_LENGTH_TOO_LARGE) if someone uploads something larger than 30MB. In order to allow for larger file size uploads, a few server changes are required.