Setup ACL for LDAP Null Base on Windows 2000

I ran ISS on one of my servers and got the following:

LDAP NullBase: LDAP null base returns information
If LDAP allows NULL base in an LDAP search, a user can submit a search that returns information on namingContexts and supported controls.  An attacker could use this information to access directory listings and plan further attacks.

Remedy:  Set up an access list control to prevent users from dumping the base of the tree or issuing a request without knowing the base object.

My question is where and how do I do this and will it adversely affect my clients (they are 98 & 2000).

Thanks.

Please also see my question regarding inverse queries on 2k dns.
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robinsonbpcAsked:
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geoffrynConnect With a Mentor Commented:
This vulnerablity exists if your AD is in Mixed mode.  Downlevel clients (Win 9x, NT 4.0) need to be able to make AD/LDAP queries as null/anonymous.  
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robinsonbpcAuthor Commented:
Thank you for your help.
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