Block access to Windows NT NetBIOS

by Wayne Maples [Published on 20 April 2004 / Last Updated on 20 April 2004]

Windows NT's Server service provides much of the NetBIOS functionality. Stop the Server service and NT will not respond to TCP ports 135, 137, and 138, as well as UDP port 139. These ports are the basis for many of NTs informational exposure. Does this mean the NT server will no longer function or that the NT workstation? No. NetBIOS functionality is disabled. The hidden admin shares like C$ are not there. NetBIOS over TCP/IP is gone. If the server is an IIS web server, a Netscape web server, a Notes server - all that should still work. What does not work is the NetBIOS gui tools Explorer and User Manager. Need them - start the Server service; do what you need; stop the Server service.

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