So I am running Guacamole 0.8.3 on an Ubuntu server and downloaded the according war-file.
When I try to log in I get the following warning and errors:
THe same thing happens for 0.9.0 and newer versions won't work for some reason. I changed the can not log in "Invalid login". I tried it with the default user and with my own that I created.
I made sure that guacd is running and can bind to an address. (localhost:45221)
(The files that contain the errors are located under /var/lib/tomcat7/webapps/guacamole-0.8.83/scripts
)