Currently Guacamole 1.1.0 is not compatible with the default encryption of Windows. If you disable NLA it should work. Open Registry editor ...
Install Guacamole 1.1.0 on Debian 10 with DB authentication (Part 1)
I started with a fresh Debian 10.3.0 with latest patches. I just installed vim and open-vm-tools because my server runs on an VMWare cluster 1. ...