On IIS 7.5, if you upload big file thru WCF service, you might get http 404.13 error from IIS server.

HTTP Error 404.13 - Not Found
The request filtering module is configured to deny a request that exceeds the request content length.

The solution is set a higher value for maxAllowedContentLength in web.config of application

<requestLimits maxAllowedContentLength="300000000"/>