Ports are basically 'endpoints' between two connections. A 'Port number' is assigned to each end, like an address, in order to direct the flow of Internet traffic.
If you are experiencing connectivity issues with any of our online games, and you have exhausted all basic connection troubleshooting, such as clearing cache, adjusting privacy settings, or disabling firewalls, you may need to add a port to your network connection.
Each game or application uses different ports, so you will have to check for the correct ports to open.
To open TCP or UDP ports, follow the instructions below:

Windows XP
Click on the 'Start' button on your Windows Taskbar.
Click on 'My Network Places.'
Under the 'Network Tasks' section, click on 'View Network Connections.'
You should now see a list of the network connections available to your PC. The network connection which you are currently using should say 'Connected.' Any other connections should read 'Disabled.'
Right-click on your current network connection and select 'Properties' from the menu list.
Click on the 'Advanced' tab.
Click on the 'Settings' button.
Click on the 'Exceptions' tab.
Click on the 'Add Port' button.
You should now see a pop-up window appear.
Name your port and give it a descriptive name so that you know what port it is later.
Enter the port number under the 'Port Number' text field.
Select either 'TCP' or 'UDP' (these should be specified in the list of ports you acquire from your game).
Click 'OK.'
Windows 7
Click on the 'Start' button on your Windows Taskbar.
Click on 'Control Panel'
In the search box type 'firewall'
Click on the 'Windows Firewall' option that appears
In the left pane click 'Advanced Settings'
If you are prompted for an administrator password or confirmation, type the password for confirmation. If not, please skip to the next step.
In the left pane of the 'Windows Firewall with Advanced Security' dialog box click 'Inbound Rules'
In the right pane, click 'New Rule'
This will cause a New Inbound Rule Wizard to run where you will be able to enter the relevant port number and to select either 'TCP' or 'UDP'
You have now added a port to your network connection. If you connect later with a different network connection, you might have to re-add any ports you entered. You might also need to repeat these steps if you need to enter multiple ports.

Ports you need to open :

UDP( one kind of port, must be labeled as such, each one is start and end port): 3478; 3479; 3658; 10070

TCP( one kind of port, must be labeled as such, each one is the start and end point): 80; 443; 465; 983; 5223; 10070-10080