No Internet Connection on Client Computer after enabling Force Tunneling on DA

Hello,

I have enabled the Force tunneling Features on DA Server and also followed the Following Link:-

https://technet.microsoft.com/en-us/library/ee649127(v=ws.10).aspx

I have followed the upper link to apply GPO on the Client Machine the only think i have not done is NRPT as i am unable to add any IPV6 address on it. and if adding it says that it already exist. Ignoring this policy i have done the Configuration. But after connection through offline Domain Join A Client computer is unable to access Internet, his Internet also gets blocked. Help me to get out from this issue.

Thanks

Roshan