/etc/init.d/iptables stop
nc -l -p <port#>

This will let you open virtually any port, between 1 - 65535

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NO, don't do what I just suggested. It will work, but people won't like it.

Here's what you can do:

-Install the service you're looking to run on your linux system
-Start that service. Generally it is "service start <servicename>", "/etc/init.d/<servicename> start", etc...
-Allow port through iptables, if enabled

~@~