There's 2 places that you have to create rules for the port opening:

#1: your router: go to advance, -ADVANCED PORT FORWARDING RULES

it should be similar to this, put the port and lan ip for your computer (not the external that is required in the arctic setup)
http://imgur.com/a/LvcYS

#2: Fire wall: follow the instructions there:
https://msdn.microsoft.com/en-us/library/hh168549(v=nav.90).aspx
make sure you checked all the options (i.e. it's active).