Restarting the VNC server (as you're doing) resets the timeout.īlackhats scan IPs and ports on these IPs all the time. VNC servers have a security feature in which they block connections for a certain amount of time once several connections fail the authentication. Vnc too many security failures simply means that someone tried to login into your VNC server and failed, several times. Welcome to the other side of the internet! The side that is not behind a NAT and a firewall. There is nothing wrong with your VNC server. Is this a possible attack? Any thoughts on how to prevent such a scenario? I am just restarting the VNC server which is allowing me to log in again using VNC. (I have no idea why I get blacklisted or why I cannot log anymore) SConnection: AuthFailureException: Authentication failureĬonnections: closed: 0.0.0.0::59748 (Authentication failure)Ĭonnections: closed: 0.0.0.0::57806 (Authentication failure)Īnd as a result, VNC server is black listing those connections and to my surprise it is resulting in preventing me from accessing the machine eventually. SConnection: Client needs protocol version 3.3 I used ssh and checked the log on the Linux machine and it shows logs like: Thu Jun 9 22:35:43 2016 Vnc too many security failures or Authentication failed, etc. Recently the VNC server/viewer started to give me some errors such as So I have this Linux VPS machine with VNC server installed and I just connect to it by using VNC viewer. Recently I started to have some problems with my Linux machine.
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