I agree that the best possible solution would be for the Windows clients
(at least TigerVNC and TightVNC) to catch up. Unfortunately this has not
happened; for the time being it would be much better if vino could offer
the option to go back to the previous Security Type when the client does
not support the new one.

The only solution now is disable the encryption completely; I resorted
to a loop back ssh connection so that there is no clear traffic on the
wifi, but I still need to do the local step with vino in clear way ---
almost safe for me because I do not have other local users, but you
never know...

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https://bugs.launchpad.net/bugs/1281250

Title:
  VNC accessible for Windows machines only with encryption disabled

Status in GNOME Remote Desktop:
  Unknown
Status in “vino” package in Ubuntu:
  Triaged
Status in “vino” source package in Trusty:
  Triaged

Bug description:
  Since a recent update, it is impossible to connect to my Ubuntu box
  using VNC from a Windows machine unless I disable encryption on the
  vino server.

  I tested up-to-date tightVNC client and TigerVNC client on the Windows
  machine, with the same result. As soon I try to connect, I receive the
  following error:

  [ 5872/ 6448] 2014-01-20 12:11:18:247   List of security type is read
  [ 5872/ 6448] 2014-01-20 12:11:18:247 : Security Types received (1): Unknown 
type (18)
  [ 5872/ 6448] 2014-01-20 12:11:18:247   Selecting auth-handler
  [ 5872/ 6448] 2014-01-20 12:11:18:247 + RemoteViewerCore. Exception: No 
security types supported. Server sent security types, but we do not support any 
of their.

  So it seems that the update changed the security type of vino to a new
  one. I searched for a way to go back to the old one (until the clients
  catches up) with no avail.

  A solution is disabling the encryption completely, by

  gsettings set org.gnome.Vino require-encryption false

  ...but this is subotpimal. Is there a way to switch the encryption
  back to the old one?

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