Network access: Do not allow storage of credentials or .NET Passports for network authentication
This security setting determines whether Stored User Names and Passwords saves passwords, credentials, or .NET Passports for later use when it gains domain authentication.
If it is enabled, this setting prevents the Stored User Names and Passwords from storing passwords and credentials.
Note: When configuring this security setting, changes will not take effect until you restart Windows.
For more information about Stored User Names and Passwords, see Stored User Names and Passwords.
Computer Configuration\Windows Settings\Local Policies\Security Options
At least Windows XP SP2, Windows Server 2003