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Disable Null Connection

Kevin Beaver explains how to disable Null Connection in a Samba environment.

How do I disable Null Connection in a situation where my domain is emulated by Samba? Is it possible to get rid of dangerous situations that can be similar to an MS domain? And how do I handle policies in such a situation when almost all the workstations are Windows XP?
In Samba, you can disable guest access and set the restrict anonymous parameter. ISS has some details on how to accomplish this here. It's important to test this off hours or in a non-production environment first to make sure nothing breaks. This site has information regarding Windows policies in a Samba environment which should get you rolling.

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