If you try to connect to a Remote Desktop 2 system using RealVNC 4.0, you may see one of these alert messages:
"No matching security types"
"Unknown message type"
You can resolve the first message by updating to Remote Desktop 2.1 and the second by configuring RealVNC's color setting to Full.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.