Be sure to create a strong password for the Workbench Admin account.
Use a generated password whenever possible. If you create a password yourself, follow these standard guidelines to make the password as strong as possible:
Do not use passwords that contain repeated elements, dictionary words, sequences of letters or numbers, user names, names of relatives, friends, or pets, or biographical information.
Use a mixture of upper-case and lower-case letters, if your can system distinguish them from each other.
Do not use the same password for different sites or for different purposes.
Do not use passwords that refer to any of your personal preferences or dislikes.
For more information, consult a standard reference on the topic of password strength.