Problem
A connection cannot be established
Possible Causes
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The listener is not running on the server.
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The port number in the client configuration file or the listener configuration file is incorrect.
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The server name provided in the client configuration file is incorrect.
Solution
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Verify that the listener is running on the server.
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Verify that the correct port number is defined in the configuration file on the client computer and on the listener computer.
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Verify that the server name provided in the client configuration file is correct.