How do check for listener services on a computer?

Posted on 2011-04-28
Last Modified: 2012-06-21
I'm running a little utility on my Windows Server 2003 called PortPeeker.  If I configure PortPeeker to listen a high-number port (like 5678), it runs w/o error.  If, however, I configure it to run at ports 21, 80, or 3389, it produces an Access Denied error.  (See image.)  I suspect this error occurs because there are services already listening at these ports.  

Does this make sense?  

If so, how do I inventory the listener services on a Windows OS?
Question by:jdana
    LVL 2

    Expert Comment

    LVL 17

    Accepted Solution

    from a command prompt
    #>netstat -anb > netstat.txt

    then open netstat.txt with notepad. It will show you all the listening ports and the app/exe listening on them

    Author Closing Comment

    LVL 9

    Expert Comment

    by:Ashok Dewan
    you can also use third party tool to view network connections

    currports , its free


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