To list your current active firewall rules, use.This however will only work with static IPs.
To prevent this from happening again, block all public IPs on your firewall with exception to those known / required IPs.
Kill the session using #kill XXXX where. If you need to regain access to your VNC, follow these steps: If VNC Viewer error ”The too many authentication failures” is experienced, this could indicate that someone is using brute force attacks to try and gain access to your server. Also change the VNC Viewer Encryption to Server, PreferOn or PreferOff. If that doesn’t resolve the problem, change your VNC Server encryption parameter to one of the other settings other than AlwaysOff. To try to resolve this, check for the latest versions of the VNC Connect and VNC Server applications and make sure to upgrade accordingly. Sometimes you can see the “ No Matching Security Types” error message because of these reasons. The version of VNC server may not support encryption. The encryption settings for a direct connection between the Server and the Viewer are not compatible. Unable to Connect to VNC Server Using Your Chosen Security Setting To rectify this, simply remove the blocked IP from the list and add it to If you use additional displays, make sure to open those ports too, for example 58 ports for the first display, 58 for the second one. Make sure that ports 58 are open on your firewall. Possible reasons why you’re experiencing this problem: If you are using multiple displays you can use any port from 5901. Make sure the VNC Server is configured to use that port. VNC not running on the specified port range. Also make sure the server is started by using When running theĬommand, set the password as the correct user. Make sure you log in with the correct user/password combination. Reasons why you may get a “connection was refused” error: VNC Viewer the Connection was Refused by the Computer If you have gone through all the above steps but you are still experiencing a problem, then log a support ticket with RealVNC here. If none of the previous steps helped, restart the VNC Server itself and the computer, which is running it. Сheck the RealVNC status page for service issues. If you’re using Linux, establish that the Linux display server protocol Wayland is disabled. For subscription users, verify that you are attempting to join your computer with the correct paid-for team. Have you selected the correct team for the remote computer?. Is “Allow cloud connections” checked in your VNC Server settings?. It is recommended that you configure the power options to ensure it never goes to sleep. Make sure that the server is not in sleep mode. 
The remote computer or server must be connected to the Internet in order for you to connect to it. Step through the following checklist to resolve the problem:
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