Allow a program to communicate through Windows Firewall

To allow a program to communicate through Windows Firewall

1. Open Windows Firewall by clicking the Start button , and then clicking Control Panel. 
   In the search box, type firewall, and then click Windows Firewall.
2. In the left pane, click Allow a program or feature through Windows Firewall.
   
   
   

   

   Left pane of Windows Firewall

3. Click Change settings.  If you're prompted for an administrator password or confirmation, 
   type the password or provide confirmation.
4. Select the check box next to the program you want to allow, select the network locations you
   want to allow communication on, and then click OK.
   
   by : http://windows.microsoft.com/