The Network Basic Input/Output System (NetBIOS) is a session layer communications service used by client and server applications in IBM token ring and PC LAN networks.
NetBIOS provides applications with a programming interface for sharing services and information across a variety of lower-layer network protocols, including IP.

By closing or disabling NetBIOS when you don't use it, you can have increased security and possibly increased transfer speed. This fix only applies to users that have a connection established through dial-up or broadband. Make sure you are NOT already using the NetBIOS (Network Basic Input/Output System) protocol or a network/LAN/WAN/peer-to-peer/etc hookup, or this will seriously impair your connection.

1. Go to Start, Settings then open up the Control Panel.

2. Double-click to open the Network applet. Find all the entries that have "TCP/IP -> besides the name(ex. "TCP/IP -> Dial-Up Adapter").

3. Highlight and click on "Properties" and go to the tab called 'Bindings'. Un-bind or de-select everything in the list, and select 'NO' if it asks you if you want to bind anything. Repeat for any other TCP/IP adapters.

4. When done, reboot your computer. NetBIOS port should be closed on the internet. You can make sure it is closed by going to the "NetBIOS" tab, and the NetBIOS option should be un-ticked in your TCP/IP adapter properties.

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by redxii edited by Monica