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I used to be able to connect to my Gnome 3 desktop from a Windows machine with a VNC client. But after an upgrade (on the Linux side) a while ago, it quit working. When I attempt to connect, all I can get is a message saying "No matching security types" or "No supported authentication methods!" (depending on which client I try).

In Gnome 3, I've turned on Screen Sharing under Settings > Sharing. Under that, I have Remote View on, Remote Control on, Approve All Connections on, Require Password off. I'm running Arch Linux with vino 3.8.1.

On the Windows side, I've tried TigerVNC 1.0.1 & 1.2.0 and UltraVNC

How can I get this working?

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Is your firewall disabled and/or configured to allow VNC traffic through to the server? – slm Jun 1 '13 at 17:11
@slm, I don't believe it's a firewall issue, because I don't think you get that error unless the client has successfully opened a connection to the server and asked it what authentication methods it supports. – cjm Jun 1 '13 at 17:14
Can you connect to the VNC server using a VNC client from something other than a Windows computer? Just trying to eliminate another variable. Also what version of Windows are we dealing with? – slm Jun 3 '13 at 0:27

2 Answers 2

up vote 14 down vote accepted

This is actually a known and currently open bug. However, there is a very easy workaround; just issue the following command:

gsettings set org.gnome.Vino require-encryption false

You will now be able to connect with most vnc viewers.

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Yes! This was it. Thanks! – cjm Jul 26 '13 at 20:08
After setting this do I need to restart vino-server or anything? I have just tried this and get the same error. – fostandy Sep 3 '14 at 12:50
This is a user level setting, so, if you're still have trouble after changing it, make sure you didn't run it with sudo. – Ryan J Mar 30 at 6:01

I think this question covers all alternative methods and suggestions how to connect to Gnome throught VNC if built-in desktop sharing does not work: Enable remote desktop for Gnome from command line?

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