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No connection could be made because the target computer actively refused it. This usually results from trying to connect to a service that is inactive on the foreign host—that is, one with no server application running.
Either you went to the wrong host, or the server application you're trying to contact isn't executing. Check the destination address you are using. If you used a hostname, did it resolve to the correct address? If the hostname resolution uses a local hosttable, it's possible you resolved to an old obsolete address. It's also possible that the local services file has an incorrect port number (although it's unlikely).