Password policy best practices? You might think that, because the default Active Directory password policy is used in myriad networks around the globe, it is based on scientific research. Microsoft Windows Maximum Password Length Active Directory 2008![]() Maximum length of password in Windows 10 Older Operating Systems prior to Windows XP While the article is focused on Windows 10, I would like to take a minute to talk about the previous operating. The maximum length of the host name and of the fully qualified domain name (FQDN) is 63 bytes per label and 255 characters per FQDN. The latter is based on the maximum path length possible with an Active Directory Domain name with the paths needed in SYSVOL, and this needs to obey to the 260 character MAX_PATH limitation. Windows Maximum Password LengthMore likely is that (PDF) are right with their assumption: Most of the ‘best practices’ in use today are based largely on folklore or, in some cases, on severely outdated theories of password strength. In the paper, they mostly discuss. From the recommendation about the maximum password age, you can infer the exact nature of the data where these best practices come from: Where security is a concern, good values are 30, 60, or 90 days. Where security is less important, good values are 120, 150, or 180 days. If you are now confused and still don’t know what maximum password age is good for your network, I recommend that you run the following command, which just translates Microsoft’s recommendation into PowerShell. Some Windows Server 2003 documentation states the maximum password length is 28 characters (e.g. Enforcing Strong Password Usage Throughout Your Organization says “Although Windows 2000, Windows XP, and Windows Server 2003 support passwords up to 28 characters, “). The Change Password dialog box that users normally use (the one that shows up when you choose Change Password after hitting CTRL-ALT-DEL) lets you enter only 26 characters. Windows Maximum Password LengthUsing AD Users & Computers, you can reset it to 32 characters. The Answer: The ResetPassword dialog box does provide a space for up to 127 characters. However, the way the edit box controls work (in the above Reset Password dialog box), when you continue to enter characters past the 32-character width of the control, it does not scroll characters to the left, but continues to accept the longer password. This can be observed when you delete the long password – it deletes the 32 visible characters (though it doesn’t visibly display the scrolling effect, it has indeed scrolled), then scrolls to the left to display the remaining characters in the 32-character window. It depends on the version of Windows you use, to be honest. If you have Windows 98/95/NT4 systems on your network you can't use more than 14 characters on those computers, so any user with more than 14 characters in their password can't log on to Windows 95/98/NT4 and earlier systems And really, if you're using those you should get rid of them). Explains that there are actually two password limitations: 'Internally, Windows represents passwords in 256-character UNICODE strings.
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