How do I change a port in Mac OS X Mountain lion

Apparently Logmein makes use of port 2002 in mac OS X Mountain Lion. I need to use that for some new accounting software. How do I change the part in Mountain Lion and how would I do an install of Logmein on the computer to use another port or how, with Logmein currently installed do I change from port 2002 to some other port. The major question is how do you change port assignments in OS x Mountain Lion?
Thanks for you help.
Tom in Dallas

There isn't a generic way to do what you want. Not on Microsoft Windows. Not on OS X.
The ICANN registry of port numbers exists so that these messes don't happen, or don't happen very often. So that there are no port conflicts among various applications, and there are ways to request ephemeral (temporary) ports, and (for some applications) to find out which port(s) the application happens to have allocated and is using. In this case, it appears that folks at LogMeIn and with the accounting software didn't avail themselves of the ICANN port database. They're using the preferences mechanism as a work-around for that.
Have a look at ipfw and pfctl tools here (see man ipfw and man pfctl at the Terminal.app prompt), and see if you can figure out how you're going to map just one local application that's opening 2002 to some other port, without disturbing the other application that's mapping to that same port (and colliding). This is the remapping mechanism and akin to what can happen at some firewalls, and not the requested control over the selected port. It's not set up to remap local application conflicts.
The selected port is either a configuration option within the specific tool, or it's hard-coded within the tool. There's no generic registry of applications and ports. That's what the ICANN port registry is for.
The worst-bad-ugly approach is to dump out the executable code, reverse engineer it, and patch the preferred port right into the code; to change the code without using the original source code. Or some tool-specific configuration file or preferences setting, as and if available.

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How do I change a port in Mac OS X Mountain lion

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