404.13 error uploading large files

Check settings:

"%WINDIR%\System32\inetsrv\appcmd.exe" list config "YourSiteNameHere" -section:requestFiltering -requestLimits.maxAllowedContentLength

Update settings:

"%WINDIR%\System32\inetsrv\appcmd.exe" set config "YourSiteNameHere" -section:requestFiltering -requestLimits.maxAllowedContentLength:2000000000

Source: http://forums.iis.net/p/1156396/1899165.aspx

It worked for me !