If you are running RealVNC for remote access you should make sure to upgrade the server software due to a recently discovered critical vulnerability. This is especially true if the VNC machine is available on the standard port and without VPN requirements.
"Using the following method, it is trivial to gain access to any RealVNC server without knowing the password. This allows full control of the target machine, with privilege levels equalling that of the user under which the RealVNC server runs - often full Administrator access on Windows desktops."
Full article on securityfocus.com: RealVNC 4.1.1 Remote Compromise