VNC User Guide - RealVNC

Chapter 7: Making Connections Secure
By default, connection requests are accepted from all client computers. To reject connection requests from a
particular client computer, click the Add button:
Specify the network address, or range of addresses, in IPv4 format, and then choose one of the following
options.
Option
Accept the connection
Reject the connection
Ask the VNC Server user what
to do
Explanation
Accepts connection requests from the specified client computer(s).
Rejects connection requests from the specified client computer(s).
Displays connection prompts enabling a host computer user to either accept
connection requests, allow ‘view only’ access, or reject requests from the specified
client computer(s). If no host computer user is present, connection requests are
automatically rejected after 10 seconds.
For more information on connection prompts, see Preventing particular users
connecting on page 113.
Note that if you do filter network addresses, the order of rules in the VNC Server - Filter Rules dialog is
important. The first matching rule determines what happens to connection requests from a particular client
computer. For example, if a rule rejecting a client computer is encountered before one accepting it, then all
connection requests from that client computer will be rejected. You can move rules up and down in the
dialog using the arrows.
By default, the Default rule accepts connection requests from all client computers. You can change this so
that it rejects or queries all connection requests instead. To do this, select the Default rule, and click the
Edit button. Note this rule is always last in the dialog.
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