Open ports in the Windows firewall using GPO

1)   1) Configuration -> Administrative Templates -> Network -> Network Connection -> Windows Firewall -> Domain Profile-> 'Windows Firewall: Define port exceptions'

2)   2) Select Enabled. 

3)  3)  Click on the Show… button to bring up the port exception list dialog

4)   4) Select the Add… button

5)   5) Specify the required port using the following syntax/convention:

6)   <port>:<transport>:<scope>:<status>:<name>

    Example: 23:TCP:*:Enabled:Telnet