I have Guacamole running on a raspberry PI 4 with a VNC connection to my Mac.
This worked reasonably well until I recently upgraded to 1.2.0. (in fairness, I did not test the connection just before upgrading, but have used it recently otherwise)
Now, whenever I try to connect to the Mac, I get "The Remote Desktop server is currently unreachable" and it retries a few times before giving up. In syslog, I see "guacd: VNC connection failed: Authentication or authorization failure"
On the Mac side, I have screen sharing enabled with a VNC password. I also tried changing to remote management, and double checked the VNC password. Screen sharing from another Mac or an iOS device works just fine. I have a few other SSH connections configured on Guacamole, and that works fine.
Appreciate any ideas on how to further troubleshoot this.