VNC User Guide - RealVNC

Chapter 7: Making Connections Secure
In certain circumstances, you may be able to conditionally display connection prompts:
• For VNC Server in Service Mode (Windows and Mac OS X), choose Show prompt only if user
logged on in order to automatically accept connections when no host computer user is currently
logged on (and therefore unlikely to be present). Note that at least one newly-connected user must then
log on to the operating system of the host computer in order to continue. Subsequently, connection
prompts are displayed again, for this user to accept or reject.
• For VNC Server in Virtual Mode (UNIX/Linux), choose Show prompt only if user connected to
automatically accept the first connection (since no host computer user can be ‘present’ at a virtual
desktop). Subsequently, connection prompts are displayed again, for this user to accept or reject.
For more information on notifications, see Notifying when users connect on page 91.
Restricting features for particular connected users
A set of VNC permissions is granted to each user who connects to VNC Server (Enterprise) or VNC Server
(Personal) using either of the following authentication mechanisms:
• System authentication. See Authenticating using host computer user credentials on page 98.
• Single sign-on. See Authenticating automatically using client computer user credentials on page 105.
Note this authentication mechanism is only available in VNC Server (Enterprise).
Note: VNC Server (Free) does not support VNC permissions. Upgrade the host computer to VNC Server
(Enterprise) or VNC Server (Personal) if security and flexibility are important to you.
VNC permissions control which RealVNC remote control features a connected user is allowed to use. By
default, a user supplying the credentials:
• Of a host computer user with administrative privileges is granted a Full set of VNC permissions.
• Of any other host computer user is granted a Default set of VNC permissions.
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