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TCP ports are open? What do I do?


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#1 RicochetMaster

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Posted 14 April 2011 - 01:22 AM

I recently did a scan of my IP address using the Network Utility on Mac OS X. It came up with the following:

Open TCP Port: 53 domain
Open TCP Port: 3333 dec-notes


But when I did a scan with the ShieldsUp! website service, it told me that absolutely no ports were open.

Could you please tell me what this means and if I should take any action? Is there any security threat here? And why does Network Utility and ShieldsUp! give me different results?

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#2 cryptodan

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Posted 14 April 2011 - 06:42 AM

How did you run these scans?

#3 RicochetMaster

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Posted 14 April 2011 - 07:49 PM

I just clicked on the network utility in the Mac utilities section, put in my IP address and clicked scan.

For the ShieldsUp! one, I did a couple of their port scans.

#4 RicochetMaster

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Posted 17 April 2011 - 06:30 PM

Hello? Can anyone help please? I just want to know if there is any security threats with having these ports open and also why Shieldsup! and Network Utility are showing different results.

#5 cryptodan

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Posted 17 April 2011 - 06:54 PM

What IP did you give it to scan your external or internal? Internal being any of the variations:

192.168.0.0/16
172.16-31.0.0/16
10.0.0.0/8

Or one that is revealed bby going here: http://www.whatismyip.com?

#6 RicochetMaster

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Posted 20 April 2011 - 06:25 AM

External.

#7 Sneakycyber

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Posted 21 April 2011 - 12:02 AM

If you had an internet browser window open (or anything that accesses the internet in the background like VOIP) then port 53 was legitimate and your computer resolved an IP address through your DNS server. Port 3333 is generally assigned to Network Caller ID service (according to Wikipedia anyways). Are you using an internet based telephone caller ID? Using VOIP such as Vonage? If your really suspicious of your the port traffic on your computer use a free program called wireshark it will show you ALL of the port connections your network is currently supporting. You can learn to use wireshark by following the tutorial video's found here

Chad Mockensturm 

Systems and Network Engineer

Certified CompTia Network +, A +





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