Unable to start RD gateway services due to its dependency service not starting (Network Policy Server service)

Hi Team,

Unable to start RD gateway service as it is showing below error message.

"Windows could not start the Remote Desktop Gateway service on Local Computer.

Error 1068: The dependency service or group failed to start"

and found that " Network Policy Server service" is in stop mode further we tryed to start the same but it gives me below error message.

"Windows could not start the Network Policy Server service on Local Computer.
Error 0x80072740: Only one usage of each socket address (protocol/network address/port) is normally permitted"

-- Also observed event ID 7023

Log Name:      System
Source:        Service Control Manager
Date:          6/5/2016 9:59:27 AM
Event ID:      7023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Server2012.i*****.****
Description:
The description for Event ID 7023 from source Service Control Manager cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event: 

Network Policy Server
%%2147952448

Kindly help me to fix the issue.

---

Thanks, Sajjan T