Blocking Netbios Port

There are many, many possibilities. You'll want to block ports 137, 138 and 139 (and probably others as well...but this is for Netbios). Take a look here for some assistance:

http://www.securiteam.com/windowsntfocus/3E5PUR5QAY.html

http://mattdrury.net/showfile.asp?which=port139.txt

http://grc.com/su-firewalls.htm

http://www.xtra.co.nz/help/0,,5739-647749,00.html

http://www.labmice.net/Security/default.htm
(Firewalls, FAQs and more...great site)

Good luck...hope this helps!

Go with the GRC.COM write up on how to do this for NT boxes:
http://grc.com/su-rebindingnt.htm

It is easy, and very necessary.

it depends. Do you want to block ports on a workstation or a NT server?
Is that system sharing files?
if the unswer is not. Just a stand alone worksation to surf the web disable de server service and computer browser service. A more sofisticated way is to use IPsec to block the netbios ports. Refer to the step-by-step doc at microsoft web to do that.

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