Tripp Lite 93-2879 - Manual (Page 72)

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specified when setting up the SDT Hosts on the Console Server was
accounts.myco.intranet.com, then specify the Destination as
accounts.myco.intranet.com:3389
If your destination computer is serially connected to the Console Server, set the Destination
as <port label>:3389. For example, if the Label you specified on the SDT enabled serial port
on the Console Server is win2k3, then specify the remote host as win2k3:3389. Alternately,
you can set the Destination as portXX:3389 where XX is the SDT enabled serial port number.
So for example, if port 4 is on the Console Server is to carry the RDP traffic then specify
port04:3389
Note http://www.jfitz.com/tips/putty_config.html has examples on configuring PuTTY for SSH tunneling