JSI Tip 1754. How do I enable NTLMv2 support for W9x clients?

I first described NTLMv2 in tip 0976.

You can install NTLMv2 support for W9x clients by installing the Directory Services Client from the Windows 2000 CD-ROM at ClientsWin9xDsclient.exe. This also installs Secur32.dll, Msnp32.dll, Vredir.vxd, and Vnetsup.vxd which support the enhanced authentication. Even if you uninstall Directory Services Client, these files will remain.

To verify the install, right click %SystemRoot%SystemSecur32.dll and choose Properties. The Version tabshould read Microsoft Win32 Security Services (Export Version) or Microsoft Win32 Security Services (US and Canada Only).

To enable NTLMv2 on the client, set LMCompatibilityLevel to 3.