Client Access Express error

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The two most common causes of this problem are:[*] The server is down[*] The server is restricted by an exit pgm I will continue my investigation and will update this thread with new information as it becomes available. For further help solving your problem, contact IBM Service.

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Client Access Express error

CA gave me the following message: "Error occured while retrieving usage information for USER_ID on TCP/IP address". Where should I look for solution? Can I get second level message? Thanks.