![]() What's New in IP Helper. And associated variance as determined by the TCP/IP. Been added to the IP Helper APIs on Windows XP with Service. Enable NetBIOS over TCP/IP with Windows Summary. This article explains how to enable NetBIOS over TCP/IP. More Information. To enable NetBIOS over TCP/IP. What What's port 445 used for in Windows 2000/XP? Among the new ports used by Windows 2000, Windows XP and Windows Server 2003, is TCP port 445 which is used for SMB over TCP. The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2000/XP. In Windows NT it ran on top of NetBT (NetBIOS over TCP/IP), which used the famous ports 137, 138 (UDP) and 139 (TCP). In Windows 2000/XP/2003, Microsoft added the possibility to run SMB directly over TCP/IP, without the extra layer of NetBT. For this they use TCP port 445. At its simplest NetBIOS on your LAN may just be a necessary evil. NetBIOS on your WAN or over the Internet, however, is an enormous security risk. All sorts of information, such as your domain, workgroup and system names, as well as account information is obtainable via NetBIOS. It really is in your best interests to ensure that NetBIOS never leaves your network. If you are using a router as your Internet gateway then you will want to ensure that it does not allow inbound or outbound traffic via TCP ports 135-139. If you're using a Firewall then you should also block the same ports - TCP ports 135-139. If you are using a multi-homed machine i.e. More than 1 network card, then you should disable NetBIOS on every network card, or Dial-Up Connection under the TCP/IP properties, that is not part of your local network. How to disable NetBIOS over TCP/IP? In Windows 2000/XP/2003 you have the possibility to disable NetBIOS over TCP/IP. You do this by right-clicking on My Network Places and selecting Properties.
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March 2018
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