The complexity rule ensures that passwords meet the following minimum complexity requirements:
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Not contain the user's account name or parts of the user's full name that exceed two consecutive characters 
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Be at least six characters in length 
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Contain characters from three of the following four categories: - 
English uppercase characters (A through Z) 
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English lowercase characters (a through z) 
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Base 10 digits (0 through 9) 
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Non-alphabetic characters (Supported characters are ~`!#$%\^&*+=-[];,/{}._|":<>?()@ 
 
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The complexity rule imposes the same requirements as the standard Windows policy “Password must meet complexity requirements.”
To configure the complexity rule
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Follow the steps outlined in Configuring Password Policy Rules. 
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On the Policy Rules tab, click Complexity Rule to expand the rule settings. 
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Under Complexity Rule, select the Password must meet complexity requirements check box. 
