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Old 11th February 2009
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jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
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OpenBSD has the fstat(1) program which can show an application that has a TCP or UDP open port; e.g.:

$ fstat | grep :1720

But an application does not have to be listening to the port for it to be open -- if pf(4) is being used, a rdr rule may open the port.
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