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I tried TightVNC and VNC Viewer (realvnc), and they both show checkboard screens (no screen only checkboard). Also, I tried RDP, same result: checkboard screen.

I tried FreeNX, but I would like stronger/better compression since I have very fast CPUs on both client and server (though the RAM on the server is only 512MB burstable to 1GB). So, I have the processing power, and I want to take advantage of that to make the connection seamless.

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Do you need X-forwarding, like remote-desktop? If you need only access to a shell on your Ubuntu box, I recommend PuTTY on your Windows box. – user13742 Jun 9 '12 at 10:54
Yes, I want to control the desktop (like in FreeNX) – wajed Jun 9 '12 at 11:29
Just googled it: tried using remote desktop w. xrdp? – user13742 Jun 9 '12 at 12:02
It gives checkboard screen, I can't see anything, only white&black net of boxes. – wajed Jun 9 '12 at 12:15

Xvnc runs its own X server, which is not necessarily connected to the desktop. You'd need to run either the vnc X extension or vino if you want to connect to the main desktop with VNC.

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