When we install Windows Server 2008, many people often meet this quite common problem: you weren't able to add a password that it would accept. It gives the following error:
"Unable to update the password. The value provided for the new password does not meet the length, complexity, or history requirements of the domain".
Actually, if you don't know the password complexity requirements for Windows Server 2008, it will completely ruin your days. Unlike the standard password required for other windows system, this one is a bit more complexity to secure your computer.
A default Windows Server 2008 installation has the "Password must meet complexity requirements" option enabled in the local policy. This will force the user to come up with a complex password. The new password must meet the following minimum requirements:
This complexity policy setting checks all new passwords to ensure that they meet basic requirements for strong passwords. By default, the value for this policy setting in Windows Server 2008 is configured to Disabled, but it is set to Enabled in a Windows server 2008 domain for both environments described in this guide
The Complexity policy is disabled by default; you can configure the password policy settings in the following location in the Group Policy Object Editor:
Computer Configuration\ Windows Settings\ Security Settings\Accounts Policies\Password Policy
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