difficulty with "msjnc" application and win-switch

[Eric Blade]

Install msjnc application from: ​http://mad-scientist.us/juniper.html

Server running application is Ubuntu 14.04-1.

Application is installed into window-switch menus as "Internet->VPN Session Disconnect". (It's actual name in the system is "Network Connect")

Attempting to run it from Window-Switch results in an xpra session briefly starting, and then closing down. Logs don't seem to match up with anything (I don't see any session logs that mention msjnc, and although I have two xpra processes and a Xvfb-for-Xpra- process left over, claiming to be :67 and :68, my only logs are for other numbers and appear to be prior sessions).

Running the application from the server itself, using:
xpra start ssh:127.0.0.1:100 --start-child=msjnc

is successful.

Apparently the windows xpra client doesn't accept the "--start-child" parameter, so I'm not quite sure how to test it when starting from remote.

The application does not succeed when running from window-switch on the local machine, either.