Each client using port forwarding to a particular server must use a different port forward port number.
If you have more than one client using the same Port Forward port number, the application display could go to the wrong client. This is an expected result, so precautions need to be taken to prevent this.
Figure 1. No Duplicate Port Forward Numbers
The sshd sets up a tunnel and listens on the port that is specified in the port forward field. This allows the Genero application (or DVM) to connect to that port and have the GUI data sent to the client. Only one listener can be listening on any port at a time. Each client needs to use a unique port number to avoid any problems.
Note: An automatic configuration solution is being worked
on but has not been released at the time of this writing.