update on large file upload issues
Installation and Configuration
ah.
http://www.checkupdown.com/status/E413.html
Quote:The Web server (running the Web site) thinks that the HTTP data stream sent by the client (e.g. your Web browser or our CheckUpDown robot) was simply too large i.e. too many bytes. What constitutes 'too many bytes' depends partly upon the operation being attempted. For example a request to upload a very large file (via the HTTP PUT method) may encounter a ceiling on upload file size set by the Web server.
think that last line is a hint: "....set by the Web server....."
Points to a server setting.