What should I do if there are vnc too many security failures in the connection?
Why is my VNC connection failing? What's the reason of so many security errors? I was surfing the internet and came across the VNC website that said - VNC® Connect is the latest version of our remote access software for personal and commercial use. It consists of a VNC® Server app for the computer you want to control, which must be licensed, and a VNC® Viewer app that you are free to download to all the devices you want to control from.
The information at this link for vnc too many security failure - https://help.realvnc.com/hc/en-us suggests to me that it was an attempt at intrusion. To succeed in establishing a VNC session a legitimate user must wait. In practice waiting a few minutes is necessary before a successful VNC session is allowed once again. There is no need to re-establish the ssh tunnel.