Question

I have a web service that takes a byte[] and saves it.

This works fine for “small” files, but once I hit a certain size the web service fails and returns “The request failed with HTTP status 404: Not Found.”

From what I’ve seen this appears to be an IIS setting that limits the size of a file that can be posted (to prevent Denial of Service attacks). I’ve tried to increase that setting, but I am having trouble determining what setting and where/how one would set it. I am using IIS7 and the webservice is done in .net (asmx).

In the web.config of the web service I have added the following (which seemed to increase the size of file that can be accepted, but not all the way to this setting size)

  <system.web>
     <httpRuntime executionTimeout="999999" maxRequestLength="2097151" />
     ...
  </system.web>

Any suggestions on where (and how) to increase the size of file that the web service would be greatly appreciated.

Answer 1

In addition to the httpRuntime/maxRequestLength mentioned in the question, it looks like there is an additional item that can be added to the web service’s web.config file to permit large file transfers.

  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="2000000000" />
      </requestFiltering>
    </security>
  </system.webServer>

This appears to enable larger files to be uploaded via web services.