To log in to a remote system located behind a firewall or NAT router, you need a tunnel.
Select the client you want to access, and click on the green button
ADD TUNNEL. Depending on the operating system the dialogue is prefilled with defaults you very likely want to use. For Windows an RDP tunnel is suggested, and for Linux SSH is used as default. The tunnel will be protected with an access control list that gives access only to your current IP address. This ACL is a second layer of security. Valid login credentials are required too.
ADD TUNNEL the connection is created instantly. Now click on the
LAUNCH TUNNEL icon and your default application for RDP or SSH opens the connection. From now on, use the username and password of the system you already have.
For RDP a configuration file for the remote desktop client is generated and downloaded. Look at the downloads of your browser and double-click.