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TCP/UDP Port ScanningTool - What is closing a port?

Posted on 2014-02-27
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Last Modified: 2014-02-28
Hello, I just want to say this is a great website.  Full of useful knowledge!

I am trying to find a utility, and how to set it up, that will scan TCP/UDP ports that can tell me what process/service that might be closing a port.  I was given the ports that I need to monitor:
1824  2063  2613  2910  2938  2939  2941  2942  4941  4942

These ports need to be open to communicate between a print server and another server running Xerox's Equitrac software.  The Equitrac software is used for secure printing.  When the user scans there card at the printer, it authenticates them to go into their queue and print their document(s).  At any given time, the user can scan their card and the scanner will not recognize their card.  After we restart the 2 Xerox Equitrac services on the print server, then it will start reading cards again.  The server with Equitrac software is 2003 R2 and the printer server is 2008 R2.

The Equitrac engineer feels one or more of the ports may be closing.

I tried using CurrPorts port scanner but not sure if this is a good utility.. And if it is, which server to run it on and how to get it configured.  Let me know if I need to provide any further information.

Thank you for your time and assistance!
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Question by:theranger969
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by:Mandeep Khalsa
Mandeep Khalsa earned 375 total points
ID: 39892281
On your Print server open a command prompt and run "netstat -a". This will give you all open ports. You can expand the command to say "netstat -a > C:\Temp\netstat.txt" which will dump all the results in a text document.

Alternatively use Wireshark (www.wireshark.org) to capture traffic on your network (make sure port mirroring is ON) and filter it by the IP addresses of your servers (print and equitrac server).
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by:theranger969
ID: 39892404
Thank you KhalsaComputer.  I will check it out.  Do you know if this will be able to identify what is closing a port if this is the case?

Thank you
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Mandeep Khalsa earned 375 total points
ID: 39892522
Since starting the service brings the communication back up, I would start with looking at your event viewer logs and see if anything is being recorded there. You could also run wireshark and capture data while the communication is down and also when the communication is working and compare to see what packets are being dropped or have errors on to get more idea of what exactly is causing the issue.
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