Large WCF web service request failing with (400) HTTP Bad Request

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Try setting maxReceivedMessageSize on the server too, e.g. to 4MB:

<binding name="MyService.MyServiceBinding" maxReceivedMessageSize="4194304">

The main reason the default (65535 I believe) is so low is to reduce the risk of Denial of Service (DoS) attacks. You need to set it bigger than the maximum request size on the server, and the maximum response size on the client. If you’re in an Intranet environment, the risk of DoS attacks is probably low, so it’s probably safe to use a value much higher than you expect to need.

By the way a couple of tips for troubleshooting problems connecting to WCF services:

  • Enable tracing on the server as described in this MSDN article.

  • Use an HTTP debugging tool such as Fiddler on the client to inspect the HTTP traffic.

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