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alex  
#1 Posted : Thursday, July 10, 2014 4:25:38 PM(UTC)
alex

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I have been researching the security issues connected to this, and about every article I read says to close down any ports you do not absolutely need open, yet nowhere is there any list of which ports one can close, or list of which ports must be open. Advice? Links?
sam  
#2 Posted : Thursday, July 10, 2014 4:26:07 PM(UTC)
sam

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U.S. Minor Islands

Get a router and a software firewall/security suite. Many ports will be closed if no program is using them. Go to grc.com and run a port scan.
John  
#3 Posted : Thursday, July 10, 2014 4:27:00 PM(UTC)
John

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If you run Windows XP (or other versions of Windows OS) you may check list of opened ports with this command:
netstat /a
Execute it in CMD window. List shows all opened ports and protocols used. If you prefer to see port numbers instead of protocol names:
netstat /an

As you've mentioned, the advice is simple. You may close all ports that your computer doesn't need. In order to do so, you may want to search info about every port in the list and then you need to find out how they could be closed. Usually it could be done by stopping some service(s), requiring that port for their work...

For example, for sharing files/folders among all my Windows computers I use only port 445 and I've closed all NETBIOS ports. It's more secure and I get rid of the chatty old protocol in my LAN.
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