I have mysql installed several months ago. However I do remember using mysql workbench successfully at one point of time. Today I try launching it and get following error
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If you are trying to use the MySQL Workbench and connect through an SSH tunnel, you will get this error when your SSH connection does not complete successfully (e.g. improper host, password, key file, etc)
A good way to trouble shoot this is to separately test the the ssh connection from the machine you are trying to connect from and establish that you can do so succesfully.