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Implementing a firewall - ports?

Posted on 2006-07-18
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Last Modified: 2010-04-18
Hi all,

Back in January we purchased a PIX firewall for our webserver, and I have decided I best get around to having it setup properly!

What I need to do is define what ports to allow access to. Now I know there are the basics like port 80 for the website and 21 for FTP, etc but I am not sure what else i need to allow. Is there a program I can get that will tell me what ports are currently open and been used?

And on the other hand, are there any ports that I definately should NOT allow access to?

We run our server from a remote location, so we use Remote Desktop Connection to admin the server, and we also deploy ASP.NET applications on the server.

Any help would be great!
Thanks - Lee
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Question by:leta37
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mass2612 earned 500 total points
ID: 17136094
Hi,

"netstat -a" will give you a list of all connections and listening ports.

I think RDP uses TCP 3389. Sorry, I don't know any specifics on ASP.net.

This link has some basics on blocking ports - http://techrepublic.com.com/5100-6228-5033634.html#
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by:leta37
ID: 17136153
Is there any third party applications I could possibly use to get the list of connections - ie. with a GUI and logging so I can print it off etc?
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Expert Comment

by:mass2612
ID: 17136239
Sorry I'm sure there are but I don't know of any off the top of my head. "netstat -a > filename.csv" will make things a bit easier to read if you can get the file to a workstation.
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by:leta37
ID: 17136254
thx mass!!!
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