failed to rdp to azure's virtual machine in RHEL using Remmina

I have no problem connecting to the virtual machines that I have created in Azure using my Windows 7.

But I do have problem connecting to them in RHEL using Remmina 0.9.3.

FQDN: <pc-name>.cloudapp.net:<port>

I have tried to modify the <port> in Azure VM's endpoint Remote desktop port to standard 3389, but still fail to connect from RHEL/Remmina while no problem connecting to the VM from Windows 7.

Error message "Unable to connect to RDP sever <pc-name>.cloudapp.net"