The request failed with HTTP status 413: Not Found., Type=System.Net.WebException

I am trying to implement a Web Service, which accepts a binary file as a byte array. At present the largest size is of about 35MB. 

In IIS i have set the configuration to 52528800 for uploadReadAheadSize.

Also, I have the following in the Web.Config for the web service already:
<httpRuntime maxRequestLength="2097151" executionTimeout="2400" useFullyQualifiedRedirectUrl="true" />

<system.webServer>

  <security>
       <requestFiltering>
              <requestLimits maxAllowedContentLength="2147482624" />
      </requestFiltering>
    </security>

</system.webServer>

But it was of no help.

Need suggestion ASAP please.