passfilt.dll

Definition of passfilt.dll in The Network Encyclopedia.

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What is passfilt.dll?

A file in Microsoft Windows NT Service Pack 3 or later that allows administrators to increase password strength. The file establishes the following rules for password creation:

  • The minimum password length is six characters.
  • The password cannot contain a username or any part of the user’s full name.
  • The password must contain characters from at least three of the following categories:
    • Uppercase letters
    • Lowercase letters
    • Numbers
    • Non-alphanumeric characters, specifically:

      . , ; : * & % !

TIP

To install passfilt.dll, first install Windows NT Service Pack 3 or later on your domain controller, which copies passfilt.dll into the %SystemRoot%\system32 directory. Then use registry editor to edit the following key:

HKEY_LOCAL_MACHINE
System
CurrentControlSet
Control
Lsa

and create or modify the following values:

  • Value:
    Notification Packages

     

  • Type:
    REG_MULTI_SZ

     

  • Data:
    passfilt.dll

     

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