If you mean enabling password strength checking, it's a host only setting (though we did build it with the possibility of extending to portals at a later point if demand was there). As to the complexity rules, some of them (e.g. use of uppercase, use of numeric characters) are hardcoded checks, but 2 of them (minimum special characters and minimum length) are configurable. However these values come from minRequiredPasswordLength and minRequiredNonalphanumericCharacters in the web.config so the values are application wide.

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