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Scan For Open Ports

Theres a very good scanner built into linux called nmap that will scan your
system and display a report on any ports and if they are TCP and/or UDP.
Install NMap
Scan Your System For Open Ports
Do A SYN Port Scan
Any ports that show up you can cross check what the typical usage on the
ports and services listing
This scan does a local system scan, ideally you need to scan your system from
another machine and change "localhost" to your computers ip address. If you
dont have another machine to use to scan your system you can use several free
online scanners:
http://www.whatsmyip.org/port-scanner/
https://www.grc.com/x/ne.dll?bh0bkyd2
http://mxtoolbox.com/PortScan.aspx