Hello, I can confirm this issue is still present on latest:
* Ubuntu 18.04.3 LTS (upgraded today)
When trying to connect from macOSX Mojave (10.14.6 (18G1012)
** its application "Screen Sharing v1.7.2(498.150)" or
** VNC® Connect Viewer v6.19.1115 (r42122) x64 (Nov 11 2019 12:05:05)

In both cases I am not able to connect to my Ubuntu desktop remotely thanks to 
this issue.
Following this advice: 
https://askubuntu.com/questions/463486/can-no-longer-use-screen-share-to-connect-mac-to-ubuntu-since-upgrading-to-14-04
 by disabling Vino's security (require-encryption = OFF) I was able to connect 
from both clients.

Now, I'm getting warnings: "The connection to this VNC Server will not
be encrypted."


When I'm connecting between two Ubuntu's 18.04 LTS or from Ubuntu to Mac, there 
has not been any issues.

** Attachment added: "Necessary config change screenshot"
   
https://bugs.launchpad.net/ubuntu/+source/vino/+bug/1281250/+attachment/5307239/+files/2019-11-23_23-54-46.png

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Packages, which is subscribed to vino in Ubuntu.
https://bugs.launchpad.net/bugs/1281250

Title:
  VNC accessible from non-linux machines only with encryption disabled

Status in TigerVNC:
  New
Status in vino:
  Confirmed
Status in vino package in Ubuntu:
  Triaged
Status in vino source package in Trusty:
  Triaged
Status in vino package in Fedora:
  Invalid

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?

To manage notifications about this bug go to:
https://bugs.launchpad.net/tigervnc/+bug/1281250/+subscriptions

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