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Serial Port Forwarding

Updated March 9, 2021. Written for LMS Version 6.2.

UCC: Applet > Terminal > Forward


Use the Serial Port Forwarding feature to make the console port of the managed device available on a local workstation via reverse SSH tunnel. In order to utilize this feature, a user must have the terminal privilege.

An SSH client with reverse tunnel capabilities is required to use this feature. Supported clients include PuTTY and the CLI Applet on the Control Center.

Prior to setting up serial port forwarding, initialize the Local Manager port with the appropriate device driver via the config init command. Refer to the appropriate device configuration guide for information.

About Connections

  • Only one TCP connection is allowed per forwarded port. Subsequent connections will fail until the first connection is exited.
  • The TCP connection can be terminated by disabling the forward setting in the SSH Applet or by closing the SSH client.
  • Connections to forwarded ports are subject to the same idle timeouts as normal terminal sessions. The idle counter is reset if data is passed over the TCP connection.


Start the SSH Applet by navigating to a device in the inventory tree and clicking on the SSH button. Once the Applet loads, authenticate with the device and log in.

Click on Terminal in the SSH Applet menu bar and select Forward.

Lantronix Control Center - Applet Terminal Forward

Mark the checkbox next to the port you wish to forward. By default, the applet will forward to a random local port. To specify a port, delete random and enter the desired port.

Lantronix Control Center - Applet Forward Settings

Click Apply to save your settings. If a random port was assigned, it will be displayed and highlighted in green.

Lantronix Control Center - Applet Forward Settings

If you specified an invalid port (in use or conflicting), it will be highlighted in red.

Lantronix Control Center - Applet Forward Settings

Click Close to return to your SSH session.

Navigate to the desired port and use the terminal forward command to start forwarding.

Lantronix Control Center - Applet Terminal Forward

Once the message Console session forwarded displays, connect to the forwarded session on your local machine. Navigate to (localhost) on the port specified earlier using your workstation application such as a browser or element manager.

Anything typed to the forwarded port will be displayed in the original terminal session.

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