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UNIX PORTS

Posted on 1998-06-18
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Last Modified: 2010-04-21
Does anyone know under what circumstances port 40067 would be opened?  Running SunOS 5.5.1,  on a Sparc Ultra 2 with Apache 1.2.6
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Question by:disleym
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by:disleym
ID: 2008090
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muesli earned 200 total points
ID: 2008091
Hi,

The answer is: under nearly any circumstances.  Ports over 1024 can be opened by any user process.  This is why most "official" services have port numbers under 1024.  (Like, HTTP = port 80)

So, port 40067 could have been opened by one of your users testing out some network server of their own.  Or, it could be the normal workings of some program you've installed.

It can also be opened due to the standard way that sockets are created on the internet.  When you telnet to a foreign host, you open a connection to [foreign host address]:Port 23.  A port must be used on your host, and it is is randomly allocated to [your hosts address]:Random Port > 1024.

The combination of the destination address with a well known port number plus the source address with a random port number > 1024 allows an internet connection to be uniquely identified.

You can check out what sockets are currently in use, as well as their destination and source addresses and ports with the "netstat" command.
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by:disleym
ID: 2008092
Sorry perhaps my question should have been clearer, I  know about Well know ports, etc, etc.  I was looking for some specific application/process that used that particular port.  Thanks anyway.
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