Hi, this is how you can fix the issue with Remote Desktop connection (through SSH tunnel) stuck in "Welcome" screen.

Recently I've encountered a problem with Remote Desktop connection where I wasn't able to connect to Windows 2008 server using RDP over SSH tunnel. This is how I've fixed it.

On my Windows 2008 server machine I went to Remote Desktop Session Host Configuration:

Then, made sure that in my RDP-Tcp connection setting and its setting for 'Restrict each user to a single session' is switched to 'NO':

That did the trick. Let me know if it helped you.