VNC User Guide - RealVNC

Chapter 7: Making Connections Secure
— Over the Internet, enter the network address of a router protecting the client computer. If you do not
know what this is, you can ask a client computer user to visit www.whatismyip.com.
For more information on private and public networks, start with Connecting within a private network on
page 27.
Listening VNC Viewer listens for reverse connections on port 5500. If a reverse connection fails, it may
be because the client computer is protected by a router and/or a firewall and these have not been
configured to allow access to Listening VNC Viewer on port 5500. For more information on this, and
connection issues in general, see Troubleshooting connection on page 26.
When a reverse connection is established, the desktop of the host computer is displayed on the client
computer in exactly the same way as it is for VNC Viewer. A Listening VNC Viewer user can control the host
computer exactly as a VNC Viewer user does. For more information, see Chapter 3, Using VNC Viewer on
page 33.
Allowing a Guest to connect
You can allow a particular user to connect to VNC Server (Enterprise) or VNC Server (Personal) as a Guest,
bypassing the authentication mechanism. A Guest typically connects infrequently, or for a short period of
time.
Note: VNC Server (Free) does not support guest connections. Upgrade the host computer to VNC Server
(Enterprise) or VNC Server (Personal) if flexibility is important to you.
To enable Guests to connect:
1. Open the VNC Server - Options dialog. More on this dialog. On the Connections tab, select an alternative
to the default None option from the Guest access dropdown:
To give users:
— The ability to remote control the host computer, select Interactive.
108 VNC User Guide