PC机不能使用FTP访问外部的资源。

原因：
------------
这个问题是由SP2造成的。执行以下KB文章中建议的步骤来解决该问题。

TCP traffic stops after you enable both receive-side scaling and Internet
Connection Sharing in Windows Vista or in Windows Server 2003 with Service
Pack 1 or Service Pack 2
http://support.microsoft.com/kb/927168/en-us

A Windows Server 2003-based computer may stop responding during shutdown
after you install the Scalable Networking Pack
http://support.microsoft.com/kb/940202/en-us

"Cannot Connect to the FTP Server" Error Message When You Access an FTP Site
http://support.microsoft.com/kb/817136/en-us