The only way I can access the sensor remotely is to use a Citrix client to connect to a Windows server. Then I use Putty to connect from the Windows server to my sensor. Now I can enjoy an OpenSSH session, instead of an openSSH window inside Citrix window. By connecting to port 2223 on Alpha, the traffic is sent to 2222 on Bravo, and from there to 22 on Charlie. This sort of access could be helpful when evading network access controls.”]
Source: https://taosecurity.blogspot.com/2006/01/simple-openssh-port-forwarding-tip.html