MSS: (NoNameReleaseOnDemand) Allow the computer to ignore NetBIOS name release requests except from WINS servers Counter Measure: Configure the MSS: (NoNameReleaseOnDemand) Allow the computer to ignore NetBIOS name release requests except from WINS servers (Only recommended for servers) entry to a value of Enabled. The possible values for this registry entry are: ? 1 or 0. The default configuration is 1 (enabled). In the SCE UI, these options appear as: ? Enabled ? Disabled ? Not Defined Alternatively, you could disable the use of WINS in your environment, and further ensure that all applications rely upon DNS for name resolution services. Although this approach is a recommended long-term strategy, it is generally impractical for most organizations to attempt as a short-term solution. Organizations that still run WINS generally have application dependencies that cannot be quickly resolved without upgrades and software rollouts, which require careful plans and significant time commitments. If you cannot deploy this countermeasure and you want to guarantee NetBIOS name resolution, you can take the additional step of "pre-loading" NetBIOS names in the LMHOSTS file on certain computers. For more information about how to pre-load the LMHOSTS file, see the Microsoft Knowledge Base article "MS00-047: NetBIOS Vulnerability May Cause Duplicate Name on the Network Conflicts" that was referenced earlier in this section. Note: Maintenance of LMHOSTS files in most environments requires a significant amount of effort. Microsoft encourages the use of WINS instead of LMHOSTS. Potential Impact: An attacker could send a request over the network and query a computer to release its NetBIOS name. As with any change that could affect applications, Microsoft recommends that you test this change in a non-production environment before you change the production environment. Fix: (1) GPO: Computer Configuration\Administrative Templates\MSS (Legacy)\MSS: (NoNameReleaseOnDemand) Allow the computer to ignore NetBIOS name release requests except from WINS servers (2) REG: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Netbt\Parameters!NoNameReleaseOnDemand