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when I use mobaxterm to connect my work PC by vnc option, I get error "no configured security type is supported by 3.3 vnc viewer "

I searched and find that setting encryption to "let vnc server choose" or "prefer on" can solve this situation.

but mobaxterm seems to have no option to set this. And unfortunately I can not change my work pc(server) vnc setting, only IT department has the permission

so it means mobaxterm is not fit for me?

Xin YANG
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2 Answers2

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Many VNC clients may not work with the newest security options that are present in the VNC Server that is provided with Raspberry Pi OS. You might see an error like this “vnc no matching security types” or "no configured security type is supported by 3.3 vnc viewer"

The solution for the home network is to downgrade the security options on the server:

Edit this file: /root/.vnc/config.d/vncserver-x11

It contains 2 line in my version (Bullseye)

Add these lines to the end of the file:

Authentication=VncAuth

Encryption=AlwaysOff

Password=e0fd0472492935da

Change the password like this:

sudo vncpasswd -service

You will be prompted for the new password

Then reboot the Pi

Jim Robinson
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Real VNC Server 6.10.1 on ubuntu 22 MobaXterm v22.1 on windows11

vnc server options

/security tab encryption: prefer off authentication: vnc password

/Users & Permissions tab set password

succeed!

guoguotao
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