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How do I disconnect users, or prevent them connecting?

You can disconnect all users immediately:


...or individually from the Information Center dialog.

By default, users can connect concurrently. You can use the parameter system to specify that only one user connects at a time.

On the Connections page of the VNC Server Options dialog you can filter connecting users by subjecting each to a prompt:


If you have an Enterprise subscription and establish direct connections, you can alternatively (or in addition) filter incoming computers to prevent connections from particular IP addresses.

By default, if a connecting user fails to authenticate properly five times in a row, their computer is blacklisted. You can lower this threshold for additional protection from brute-force or port scanning attacks.