Secure Ports

Neither NT nor W2K does offer any firewall capacity on its own. You need to install a special application for it, e.g. Microsoft ISA Server 2000 or many cheaper (and sometimes better) alternatives.
However if all you want is port blocking, the NAT functionality of NT and 2000 might be enough. Search the docs on NAT; there is a control panel applet to steer NAT but it ain't easy...

Have fun,

- The Netherlands

Simply, if you don't have the documentation for your firewall, you need to contact the supplier and ask them for the guides. These will tell you how to access and use the configuration program that came with the firewall, and should also have a list of the various ports and their usual uses. The settings for the firewall are nothing to do with the Windows system itself.

HTH

Richard

Actually, you can filter IP packets in Windows 2000 under the TCP/IP Properties / Advanced.

If you already have a firewall but just need to know what services run on what ports, look here: http://www.iana.org/assignments/port-numbers

Answer #3 is good for a more upto date list of ports, but the services file should suffice.
Follow answer #2 to configure your firewall.
I strongly recommend you block everything below 1024, then allow only those ports you must have open. Depending on the sophistication of your firewall, you may be able to block ports above 1024 unless opened by a session through an allowed port.
Learn some more about how TCP/IP works in general. You really need to understand at least the basics to effectively configure a firewall.