The only way to access to the challenge workspace is through the WebPortal (portal.nice-challenge.com). Although, be aware that if you do not have an active workspace from a reservation then there will be no challenge workspace deployed for you to access.
When accessing consoles to virtual machines from the Webportal we suggest you use the HTML5 console, it is the preferred method of accessing virtual machines and works well in most cases with no need to install anything.
