Not long ago I notice interesting “feature” of WCF REST, hosted in the IIS7: when size of data from client exceeds some value, service broke the connection. I created test service, where I could reproduce this issue, using WCF REST Starter Kit (you can download here actual release, Preview 2). One of service's method is: [WebHelp(Comment = "Sample description for DoWork")] [WebInvoke(UriTemplate = "DoWork", Method = "POST")] [OperationContract] public SampleResponseBody DoWork(SampleRequestBody request)...