Remote Desktop Services with Session Host Configuration

Hello Everybody,

I try to configure RDS scenario with two servers. The first is RD Web Host, RD Connection Broker and RD Licensing Host. This server has two network interfaces, one private, and one public. The second server is RD Session Host, and has only one network interface, private. I would like to login on RD Web Host, and connect to the first server, to redirect connection to second server. I have registered internet domain, and the same domain is in Active Directory. I received error when i try to configure session collection, cannot connect to server. When i try to ping this server, i received response from internet domain. Could someone tells me, how configure this scenario? I would like to separate Session Host server from other services.

Please help.