Open Ports.

I want to know how would I be able to close open ports on my computer.
I performed a port scan of my pc, and found serveral open and unidentified ports. And am interested in closing some of them.

Also, is there a site that I could go look at a listing for all ports and see what uses what port?
I know of the services file in Windows, but as you all know it only lists registered ports.

I once heard of a site that gave you a comprehensive list of most of the TCP and UDP ports.

ProtorianAsked:
Who is Participating?

Improve company productivity with a Business Account.Sign Up

x
 
Droby10Connect With a Mentor Commented:
once again, i'll recommend foundstone's fport utility.

http://www.foundstone.com/rdlabs/tools.php?category=Forensic

it will tell you what executable or library is bound to what port...then you can make an assessment as to whether it's detrimental or not, or malicious or not.  
0
 
scott_rentonCommented:
The first step to closing a port, is to find out what opened it in the first place.  For instance, if you're running a web server, you're going to listen for requests on port 80, or 443 (for ssl communications).  SMTP servers will listen on port 25 for incoming connections, POP connections on 110.

http://www.iana.org/assignments/port-numbers

This is a list of well-known ports & their use.  Start here, compare your ports to this list, then find the programs that are running & listening on those ports, and stop them.
0
 
stevenlewisCommented:
also check out www.grc.com
shields up
and check out Zonealarm at www.zonealarm.com (free personal firewall, software)
for best results get a hardware firewall solution
0
Improve Your Query Performance Tuning

In this FREE six-day email course, you'll learn from Janis Griffin, Database Performance Evangelist. She'll teach 12 steps that you can use to optimize your queries as much as possible and see measurable results in your work. Get started today!

 
ProtorianAuthor Commented:
I have installed a firewall.
And have ran the sheilds up test.

I want to know how to close the open ports.
The ports are still open.
Even though they are behind the zonealarm. I did a port scan from the same computer, and saw that the ports are still open.


Is this such a hard question?
0
 
stevenlewisCommented:
What ports are open? some need to be open like 80
scan your machine for viruses/trojans, as they may have opened these other ports for you
also unbind netbeui form you dialup adapter (or NIC if using dsl/cable)
disable file and printer sharing, and remove all un-needed protocols
0
 
Bruce_RCommented:
you already mentioned grc.com , there's a good tutorial on there at

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

0
 
ProtorianAuthor Commented:
Ok,
Let me put it like this.
The computer in question is a server. It does nothing but run a web server, ftp server and a web based email server.

Therefore I need to have ports 80, 21, 20, 8080, 43 and 8383 open.

The computer was hit by more than one trojan virii and we have gotten rid of the virii but some of the ports are still open.

0
 
stevenlewisCommented:
For a web server I strongly suggest a hardware firewall solution.
0
 
ProtorianAuthor Commented:
Thank you a million..
I was able to analyze my problem and solve it.
Thankx
0
 
Droby10Commented:
anytime.  glad you were able to resolve the issue.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.