Since the mid 1990's Network Address Translation (NAT) was designed to alieviate IP address exhustion.  Along with this technology came the ability for network administrators to control what outbound ports users could access.  Example, for

 Here's a great tip on using a free admin tool  called Netcat (for Windows & Linux).  Netcat can be used  for a multitude of purposes but in this case we will use it to simulate a