Im a little confused to the answer to the related question.. I too have the same issue as the originator of the message and would like to disable NULL base queries on a 2003 AD server.
however, I read on http://technet.microsoft.com/en-us/library/cc781273(WS.10).aspx
that ..."By default, Active Directory does not accept null session queries".......... meaning to me, it is turned off be default.
The accepted solution to this original question says that you cant turn it off and if you did AD would break....
I realise the link i sent is old... does anyone have the definitive answer with a link to an authoritive document ?
please note, my knowledge of this area is very limited.!