I KNOW!!! i found it out 2day , no one helped me and i was just messing around ....ill tell ya the secret 
1.foward the port , (dosent matter if ur using wired or wireless mainly same idea)
2.right click on connection on bottom right of the screen
3.clikc view network connections
4.(im using wireless) right click on connection ur using , then properties,advanced tab, there should be something saying "protect my computer and network by limiting or preventing access to thwe internet" tick this
5.go to settings , then ICMP tick ALL OF THEM (this is unsafe so use a firewall, may it be router or pc firewall) .
6. go to run in start , then type "cmd" (w.o quations)
7type "ipconfig /all"
8.write down "ip adress"
9. go back to the connection settings, and go to services then add a new one . it should be like this :
description : <enter anything here>
name or ip adress : < enter ur ip adress u wrote down>
external prot number: <enter port, in this case 27015>
internal port number : <same as above , 27015>
tick TCP .
press ok
10. do step 9 again BUT tick UDP this time
and.... that it! start up server , but make sure the port number is 27015, this works for the dedcated server but i dunno about listen.
i hope this worked for you as it did for me
thankyou for reading
-irish_knight (if u have any questions ask me) irishnightrider@hotmail.com
1.foward the port , (dosent matter if ur using wired or wireless mainly same idea)
2.right click on connection on bottom right of the screen
3.clikc view network connections
4.(im using wireless) right click on connection ur using , then properties,advanced tab, there should be something saying "protect my computer and network by limiting or preventing access to thwe internet" tick this
5.go to settings , then ICMP tick ALL OF THEM (this is unsafe so use a firewall, may it be router or pc firewall) .
6. go to run in start , then type "cmd" (w.o quations)
7type "ipconfig /all"
8.write down "ip adress"
9. go back to the connection settings, and go to services then add a new one . it should be like this :
description : <enter anything here>
name or ip adress : < enter ur ip adress u wrote down>
external prot number: <enter port, in this case 27015>
internal port number : <same as above , 27015>
tick TCP .
press ok
10. do step 9 again BUT tick UDP this time
and.... that it! start up server , but make sure the port number is 27015, this works for the dedcated server but i dunno about listen.
i hope this worked for you as it did for me
thankyou for reading
-irish_knight (if u have any questions ask me) irishnightrider@hotmail.com