Optional. If the strAuthority parameter begins with the string 'kerberos:', Kerberos authentication is used and this parameter ...

Optional. If the strAuthority parameter begins with the string 'kerberos:', Kerberos authentication is used and this parameter should contain a Kerberos principal name. If the strAuthority parameter contains any other value, NTLM authentication is used and this parameter should contain an NTLM domain name. If you leave this parameter blank the operating system negotiates with DCOM to determine whether NTLM or Kerberos authentication is used. This parameter should only be used with connections to remote WMI servers. If you attempt to set the authority for a local WMI connection, the connection attempt fails. For more information see Using Kerberos or NTLM Authentication with the Scripting API in the WMI SDK help file for more information.