RDP works but not RemoteApps

Hi

I am kinda new here.

I installed Hamachi on the server and my remote client and RDP works fine. 

But when I try to do RemoteApps (https://Servername/Rdweb), I can logon , I can click the icons, but when it tries to connect, it said, the remote computer could not be found. Please contact helpdesk about this error. 

I can do this within the same network,, so it seems to be an error on hamachi/network side. 

I disabled all the firewall.

Please advise. 

Thank you.