This parameter determines whether or not smbd 8 will send the server-supplied principal sometimes given in the SPNEGO exchange. If enabled, Samba can attempt to help clients to use Kerberos to contact it, even when known only by IP address or a name not registered with our KDC as a service principal name. Kerberos relies on names, so ordinarily cannot function in this situation. If disabled, Samba will send the string not_defined_in_RFC4178@please_ignore as the 'rfc4178 hint', following the updated RFC and Windows 2008 behaviour in this area. Note that Windows XP SP2 and later versions already ignored this value in all circumstances. no