Can you be more specific about what your client is trying to do at the time of the error? A very short code excerpt would help.
Also, please post the actual exception and stack trace you see on the client side.
Look in the server.log around the time of the attempted client access. If there is anything relevant there please post it here as well.
Although you are encountering this problem when you try to run a client, from the symptoms you described the underlying problem may be on the server. If so, the topic's title may be discouraging people from reading this topic who might otherwise be able to help.
- Tim
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