Ok, looks like the old authentication is enabled in your case. You didn't say which server you are using, but I guess it's a new one (maybe 5.7) where the old authentication no longer works. So make sure it's not active in your connection:
If you use the latest version of MySQL Workbench then you will not find this setting anymore.
Mike
Mike Lischke, MySQL Developer Tools
Oracle Corporation
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Edited 1 time(s). Last edit at 11/25/2015 02:05AM by Mike Lischke.