[ubuntu] Can not connect to windows machines using VNC

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http://ubuntuforums.org – Hi, I am using ubuntu server 11.10 ( I have Installed Ubuntu-desktop environment on in) , We have many windows machines in our network each windows machine have Real VNC server installed on them. I am able to connect VNC from windows to windows but not able to connect VNC from ubuntu server to Windows machine. I am using default VNC from terminal. Whenever I try to connect any vnc machine it gives me error-- CConn: connected to host 172.x.x.x port 5900 CConnection: Server supports RFB protocol version 4.1 CConnection: Using RFB protocol version 3.8 CConnection: No matching security (Hardware)