星期四, 10月 12, 2006

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.

星期一, 10月 09, 2006

星期日, 10月 08, 2006

电子图书

电子图书

提供的10000本书均为PDF格式,阅读前请先下载安装阅读器,如系统已安装相应阅读器可跳过此项(英文Adobe Acrobat可能会要求安装亚洲语言支持)。

改為香港祈禱

助養多年的兩個女孩,一個是孟加拉的,一個是越南的。應該已經差不多成年了吧? 今天,毅然放棄助養,是因為覺得香港的年輕一代更需攜助與支持。宣明會對香港的林鄭災難,以祈禱來解決,那麼我也祈禱那不富裕的外國家庭可以繼續讀書。 香港的未來,更應該給他們校園的陽光,而不是鐵窗密室! ...