Question

I need a way to upload large files (50+ MB) in my .net mvc3 website (hosted on Amazon). After trying to upload a large zip file (36.9MB) FireFox shows “The connection was reset” screen and FireBug shows “Aborted” under status.

Any ideas on how I could solve it?

Controller:

private void SaveFile(HttpPostedFileBase uploadedFile)
{
    using (var file = System.IO.File.Create(Server.MapPath("/uploads/" + uploadedFile.FileName))
        uploadedFile.InputStream.CopyTo(file);
}

Web.config:

  <system.web>
    <httpRuntime maxRequestLength="56320" executionTimeout="1500"/>
</system.web>

  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength= "10485760"/>
      </requestFiltering>
    </security>
  </system.webServer>

Answer 1

The maxAllowedContentLength property is in bytes:

<requestLimits maxAllowedContentLength= "10485760"/>

10485760 bytes = 10MB. So if you try to upload a file that is larger than 10MB you will fail.

Be consistent between your maxRequestLength which is in KB:

<system.web>
    <!-- Limit file uploads to 55MB -->
    <httpRuntime maxRequestLength="56320" executionTimeout="1500"/>
</system.web>

which indicates a limit of 55MB and your requestLimits. Like this:

<system.webServer>
    <security>
        <requestFiltering>
            <!-- Limit file uploads to 55MB -->
            <requestLimits maxAllowedContentLength="57671680"/>
        </requestFiltering>
    </security>
</system.webServer>