Remote Access Server issue in azure vm

Hi,

Recently I configure my domain in Azure and i have successfully configured 3 server as

Server 1 : AD, DNS              10.0.3.4

Server 2 : RRAS with NAT     10.0.3.5

Server 3 : File server            10.0.3.6

We deployed Site to site connection to on-premises and everything working fine for internal users except for VPN users

Problem:

I have a few client they work from outside So, I install and configured RRAS server

RRAS server has single NIC with static address pool 10.0.3.50 to 10.0.3.100 using this link :  https://blogs.msdn.microsoft.com/lighthouse/2013/07/30/how-to-deploy-sstp-and-l2tp-vpn-in-windows-azure-windows-server-2012/ 

Now i have two problems

1.RRAS Client can't able to ping Server 2(RRAS Server) 10.0.3.5 but they can ping Server 1 & 3 (10.0.3.4 and 10.0.3.6) successfully
2.azure network (10.0.3.0/24) & my on-premises network (10.0.0.0/24) can't able to ping RRAS Client

This is my current diagram

Please kindly let me now is there any specific setting need to done for azure server or NAT configuration  

Kindly guide me to solve this problem

Thanks

Nihal