Make sure MySQL server is launched on the target machine. Also please check the port number field to verify that you have specified the correct number. You can check is the server allows remote connection by running the following statement from command line:
telnet <mysql server IP or network name> 3306
If the issue persists, read Configuring MySQL article for possible workaround.
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See also
Useful MySQL Queries
Tuning MySQL Performance
How to Backup and Restore MySQL Database