Tech Tip: Protect your server with TCP/IP security

Windows NT is not known for its rock-solid security, but that doesn't mean you should leave your servers open for attack. NT includes some security features that can help you control what kind of traffic is able to reach the server.

To configure this information, follow these steps:

  1. Right-click Network Neighborhood, and choose Properties.
  2. On the Protocols tab, choose TCP/IP Protocol, and select Properties.
  3. Click Advanced.
  4. Select the Enable Security check box at the bottom of the screen, and click Configure.
  5. The TCP/IP Security dialog box allows you to specify what you want to do with specific TCP and UDP ports and IP protocols. You can permit all or specific ports and protocols.

By default, the TCP Ports, UDP Ports, and IP Protocols boxes all indicate Permit All, which means that all TCP/IP traffic is accepted.

To only allow certain traffic, choose Permit Only in the appropriate box, and indicate what ports are open on this server. Unfortunately, there isn't a Permit All Except option, which means that an administrator must proactively enable each protocol.

At the top of the TCP/IP Security dialog box, there's an Adapter drop-down list. Choosing the wrong network adapter can severely impact how users handle the resources on the server.

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