Connection / Port Forwarding / Remote/X11
The Port Forwarding/Remote/X11 category of the Session Options dialog allows you to configure secure connections through an SSH server to an application that resides on the SSH client -side, and to enable the forwarding of X11 packets.
Remotely forwarded connections
Name
Displays the unique identifying name for the connection.
Remote Address
Displays the port number on the remote machine that is used for this connection.
Local Host
Displays the hostname or IP address of the local machine and the local port number.
To create a new port-forwarded connection, click on the Add... button to open a blank Remote Port Forwarding Properties dialog. To modify an existing connection, select that connection and click on the Edit... button to open that connection's Remote Port Forwarding Properties dialog. To remove an existing connection, select that connection and click on the Delete button.
X11 forwarding
Forward X11 packets
Check this option to allow the forwarding of X Windows packets through the SSH session , which makes possible the encryption of the data between the client and server
Note: SecureCRT is not an X Server. The Forward X11 packets option allows SecureCRT to accept X11 data from the remote machine and forwards it to the X server running on the local machine. The local X Server must be running before any X11 sessions can be displayed. If you are using Xhost authority access on the local X11 server, you will need to add the localhost or loopback address 127.0.0.1 to your server's Xhost list.
Enforce X11 authentication
Check this box to instruct SecureCRT to enforce X11 authentication.
Note: It may be helpful to disable this option when switching to a different user before launching an X application. If this option is enabled and the secondary user's .Xauthority file does not match the initial user's file, access to the X server will be denied.