I finally found the solution !!
After many many hours of firewall rule setting etc, I came up with an idea.
Windows Computer need to be switched as "Network Profile: Private" and not Public. Setting it up as public , because of security it make LAN connections that outgoing from that pc Invisible.
So if anybody else face that problem, do the following:
Open Network Connection & Properties in the control panel of your windows computer
And make sure that Network Profile is set to Private
And it is done
Note that If you have a laptop , you may need to do the same procedure for Ethernet and WiFi Network profile.
Are you having trouble getting Virtual Radar Server installed and running? If so then this is the place to ask about it.