When connecting with Remmina to a Raspberry Pi using VNC I’ve been getting issues lately. I got an error like:
Unknown authentication scheme from VNC server: 13, 5, 6, 130, 192
When searching for a solution I came acros two posts:
- https://raspberrypi.stackexchange.com/questions/142654/remmina-does-not-connect-to-raspberry-pi-bullseye-after-realvnc-server-update
- https://superuser.com/questions/1532602/remmina-unknown-authentication-scheme-from-vnc-server-13-5-6-130-192
The stack exchange answer, described a solution which on its own did precisely nothing for me to resolve the issue. However, it did force me to fill in a password, and change the encryption option to prefer on:
# echo 'Encryption=PreferOn' >> /root/.vnc/config.d/vncserver-x11
# vncpasswd -legacy -service
Setting "Password" VNC parameter for Service Mode server
Password:
# systemctl restart vncserver-x11-serviced
When executing vncpasswd -legacy -service, and you wanna fill in an insecure
password, e.g. less than six characters. you can add the -weakpwd flag:
vncpasswd -service -weakpwd
However, after adding the following line (from the super user answer) to
/root/.vnc/config.d/vncserver-x11:
Authentication=VncAuth
It worked again. As a one liner:
echo "Authentication=VncAuth" >> /root/.vnc/config.d/vncserver-x11
Forgot VNC password on Raspbian / Raspberry Pi OS
Additionally, you can restore your VNC password by changing the line starting
with Password= in /root/.vnc/config.d/vncserver-x11 to e.g.
c3abbea3b003a0b231737c0541892d72 (which would change it to raspberry):
Password=c3abbea3b003a0b231737c0541892d72