In order to get more information about the actual problem try the following:
- show the Output window in Visual Studio and check whether there is an exception when you're running your application in debug mode.
- access the .svc file directly in your browser to see if it reports any problems.
- enable the CLR exceptions from Debug --> Exceptions menu in Visual Studio and run your project in debug.
Judging by your description, most likely this is a timeout problem, but we cannot be sure without a runnable sample. We suggest that you add the maxBufferSize, maxReceivedMessageSize, receiveTimeout and sendTimeout attributes to the web.config. Also you have to set them explicitly on the client as well as shown in the Using Custom Bindings
If you are unable to identify the problem, provide us with a sample runnable project that exhibits the issue and we would advise you once we review it.
the Telerik team
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