Thanks, I'm sharing the url know as well since that can be useful to
check the status,

https://gitlab.gnome.org/GNOME/vino/-/issues/12

** Bug watch added: gitlab.gnome.org/GNOME/vino/-/issues #12
   https://gitlab.gnome.org/GNOME/vino/-/issues/12

** Changed in: vino (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1883155

Title:
  Vino advertises TLS even when require-encryption is false

Status in vino package in Ubuntu:
  Triaged

Bug description:
  I have an old Xubuntu system which I administer remotely from a
  Windows machine using UltraVNC. This doesn't support encryption, but
  since it's on a local net this is acceptable, and it has worked fine
  for years.

  I have just installed Xubuntu 20.04 on a new machine, and have
  installed Vino from the repository and configured it using gsettings
  to the same values as on my old system. The settings are as follows:

  org.gnome.Vino prompt-enabled false
  org.gnome.Vino require-encryption false
  org.gnome.Vino use-alternative-port false
  org.gnome.Vino disable-background false
  org.gnome.Vino disable-xdamage false
  org.gnome.Vino alternative-port uint16 5900
  org.gnome.Vino icon-visibility 'client'
  org.gnome.Vino authentication-methods ['vnc']
  org.gnome.Vino network-interface ''
  org.gnome.Vino notify-on-connect true
  org.gnome.Vino mailto ''
  org.gnome.Vino lock-screen-on-disconnect false
  org.gnome.Vino use-upnp false
  org.gnome.Vino vnc-password 'xxxxxxxxxx=='
  org.gnome.Vino view-only false

  When I start the server, this is what I see:

  10/06/2020 20:25:40 WARNING: Width (1366) is not a multiple of 4. VncViewer 
has problems with that.
  10/06/2020 20:25:40 Autoprobing TCP port in (all) network interface
  10/06/2020 20:25:40 Listening IPv6://[::]:5900
  10/06/2020 20:25:40 Listening IPv4://0.0.0.0:5900
  10/06/2020 20:25:40 Autoprobing selected port 5900
  10/06/2020 20:25:40 Advertising security type: 'TLS' (18)
  10/06/2020 20:25:40 Re-binding socket to listen for VNC connections on TCP 
port 5900 in (all) interface
  10/06/2020 20:25:40 Listening IPv6://[::]:5900
  10/06/2020 20:25:40 Listening IPv4://0.0.0.0:5900
  10/06/2020 20:25:40 Clearing securityTypes
  10/06/2020 20:25:40 Advertising security type: 'TLS' (18)
  10/06/2020 20:25:40 Clearing securityTypes
  10/06/2020 20:25:40 Advertising security type: 'TLS' (18)
  10/06/2020 20:25:40 Advertising authentication type: 'No Authentication' (1)
  10/06/2020 20:25:40 Re-binding socket to listen for VNC connections on TCP 
port 5900 in (all) interface
  10/06/2020 20:25:40 Listening IPv6://[::]:5900
  10/06/2020 20:25:40 Listening IPv4://0.0.0.0:5900
  10/06/2020 20:25:40 Clearing securityTypes
  10/06/2020 20:25:40 Clearing authTypes
  10/06/2020 20:25:40 Advertising security type: 'TLS' (18)
  10/06/2020 20:25:40 Advertising authentication type: 'VNC Authentication' (2)
  10/06/2020 20:28:21 [IPv4] Got connection from client xxx
  10/06/2020 20:28:21   other clients:
  10/06/2020 20:28:21 WARNING: New width (1366) is not a multiple of 4.
  10/06/2020 20:28:21 Client Protocol Version 3.4
  10/06/2020 20:28:21 Ignoring minor version mismatch
  10/06/2020 20:28:21 rfbClientConnFailed("No security type suitable for RFB 
3.3 supported")
  10/06/2020 20:28:21 Client xxx gone

  Note that it says "Advertising security type: 'TLS' (18)" even though
  I have set "org.gnome.Vino require-encryption" to false. And as a
  result, I can't connect from my Windows box.

  Can anyone tell me what to do to fix this?

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