@DaveO,   The exception means that the agent cannot log into the supervisor.  For some reason the agent's password is not the same as the running supervisor.  I wonder if this host had an agent already running when you tried to install or something like that.   To correct this, check for running supervisor processes For example "ps aux |grep supervisor | grep agent" and kill them if they are any   When no supervisor processes are running, try starting the agent again and see if it starts/connects to a new supervisor.       ... View more