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The problem is that the C API function mysql_real_connect only attempts to connect to the first IP address returned for a hostname. This can be a problem if a hostname maps to multiple IP address and the server is not bound to the first one that is returned. The solution is to augment mysql_real_connect so that it attempts to connect to all IPv4 addresses that a domain name maps to. The function goes over the list of address until a successful connection is established. No test case is provided as its not possible to test this automatically with the current testing infrastructure.