I followed documentation specifying the way to setup the LogOffURI.
My agent is then configured accordingly (see the log).
But I never logout. I don't have any single sign-on in my config.
In this case the agent's logoffURI agent configuration object parameter was defined as: "/logout.htm"
The logout request was actually calling: "/html/logout.htm"
The logoffURI ACO parameter must be the full URI path (not filesystem path); which in this case should be "/html/logout.htm". Also note that the logoff resource must not be protected.