SkyVaultNtlm is the subsystem
  configured by default in the SkyVault
  authentication chain. It performs authentication based on user and password
  information stored in the SkyVault repository.
  It is capable of supporting both form-based login and NTLM-based Single
  Sign-On (SSO), as well as providing authentication for the CIFS server.
  
    Note: The NTLM SSO functions are disabled by default, which means there
    are no assumptions about the availability of a Windows domain. You can
    activate SSO with a single property, without any changes to the
    web.xml file or further file server
    configuration.
  