I am trying to set up a VNC connection from my PC (Ubuntu 18.04) to a headless (I can use only terminal) Raspberry Pi zero w (Rasbian 2020) using Remmina, but I am getting the error window:

Unknown authentication scheme from VNC server: 13, 5, 6, 130, 192

I have installed vnc in the raspberry and started it with vncserver :1. It gave me an IP-like thing. Then I have set a password with sudo vncpasswd -service and with vncpasswd -user using the same password. Then I tried to connect from the Ubuntu (PC) by using Remmina with the following credentials:

Server: [the IP-like address]

Repeater:

User name: [my_username]

User password: [server_or_user_password]

I tried both passwords, adding the line Authentication=VncAuth to the end of .vnc/config.d/vncserver-x11 and disabling encryption. In all cases, Reminna opens the error window and I can't connect.

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4 Answers

I tried both passwords, adding the line Authentication=VncAuth to the end of .vnc/config.d/vncserver-x11 and disabling encryption

Modifying the .vnc/config.d/vncserver-x11 file changes how vncserver runs in service mode. These settings are ignored if you launch vncserver directly. Given that you're starting vncserver as follows

I have installed vnc in the raspberry and started it with vncserver :1

it means that the authentication method for that vncserver instance will not be using Authentication=VncAuth but instead the default (which Remmina doesn't understand).

To resolve this problem, start vnc server as follows:

$ vncserver -Authentication VncAuth :1

Note that these arguments are case sensitive (and doesn't always give useful error message if you get it wrong).

1

A bit neater write up on the same under the link below. Tested against default VNC server on Raspberry Pi 3 running Debian 11 (Bullseye).

====== Connect to Raspberry Pi OS via VNC using Remmina ======

-- //Tested with Raspberry Pi OS on July 2020// --

When trying to connect from your Linux machine using Remmina to a Raspberry Pi running Raspberry PI OS with RealVNC enabled you get the error

 Unknown authentication scheme from VNC server: 13, 5, 6, 130, 192

RealVNC only supports a few security schemes. Authentication=VncAuth seems to be the only scheme that allows direct connections from VNC-compatible Viewer projects from third parties. In order to change to VncAuth scheme in your Raspbian and set a password to accept connections from Remmina VNC plugin, open a SSH session (or a terminal window) on the Raspberry and generate your VNC password with:

sudo vncpasswd -service

Now, edit the file /root/.vnc/config.d/vncserver-x11

sudo nano /root/.vnc/config.d/vncserver-x11

and add the following line at the end of the file:

Authentication=VncAuth

Now your config file should look more or less like mine:

 _AnlLastConnTime=int64:0000000000000000 _LastUpdateCheckSuccessTime=int64:01d65c12272dff1a _LastUpdateCheckTime=int64:01d65c12272dff1a Password=c3abbea3b003a0b231737c0541892d72 Authentication=VncAuth

c3abbea3b003a0b231737c0541892d72 is the encrypted version of ''raspberry''; your line will be different.

Eventually, restart the VNC server service with

sudo systemctl restart vncserver-x11-serviced

and you are ready to connect to you Raspberry Pi using Remmina.

I know this is an indirect solution for the above error. This will install Real VNC Viewer and use this to create a working VNC connection out of the box.

Download the Real VNC Viewer from here. After installing and starting the program, I had to put the Domain (The raspberry IP and not the "IP-like thing"), the username and the user password.

The installation was done on the command line using:

wget
sudo dpkg -i VNC-Viewer-6.20.529-Linux-x64.deb 

Tested on Ubuntu 18.04.

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Firstly, I think that this question belongs to the raspberry pi exchange.

Secondly, you probably need to disable encryption in remmina connection settings.

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