Container Authentication means that the servlet container or web server will authenticate the user. To find out if the user is logged in or not, Connect Daily will call HttpServletRequest.getRemoteUser(). If this returns a value, that value is used as the login name.
Before continuing, add at least one administrator level account to Connect Daily that has a user name you will use for container login.
Add a line to the cdaily-3.4.11/WEB-INF/configuration.properties that specifies the Container authentication provider: