Remote App connection problem

In my environment, there are 2 servers (hkrdss01 and hkrdss02)

Cluster:hkrdss (including hkrdss01 and hkrdss02)

Server 1:hkrdss01 (also act as RD connection broker)

Server 2:hkrdss02

Remote app (VNC viewer) is offered for use.

- Everytime when establish connection, cert. need to install from hkrdss02. Is this means everytime connection to hkrdss02 first ?? And why no hkrdss01 ??

- By using XP to make connection, remote app will not launch automatically. I have to login then VNC viewer launch.

But this problem haven't in Win7. So anything wrong.

Thanks