unable to detect the server in tunnel mode after setting up DNS correctly in mobile device

I have configured the mobile device DNS correctly with the Neoload IP.
The device (mobile) and the neoload are in the same wireless network. The Neoload IP(laptop connected IP) is set as the DNS/proxy in the mobile device. But still i am not able to detect the server while browsing through native app from the mobile device. Can i get a proper guidelines about the configuration with snapshot (preferred) of both neoload running machine and mobile device in tunnel mode. I have gone through the documentation of mobile testing as well but i am not getting the proper solution.
Thanks in advance for suggestion