[winswitch] xpra initialization error: failed to identify the new server display!

[Antoine Martin]

(..)
> As an example, I want to run a terminal window on the server and share
> it on both clients. All involved machines run debian strech (yet).
> 
> On the server I start a session with
> 
> $ xpra start :30 --sharing=yes
> 
> then I start mate-terminal on that server.
> On the first client, I attach with
> 
> $ xpra attach ssh:max at xxxxx.org:30 --desktop-scaling=off --quality=100
> --sharing=yes
> 
> This works as expected, I see and can use the terminal.
> On the second client, I try to share with
> 
> $ xpra shadow ssh:max at xxxxx.org:30
Don't use shadow for the second user, just use attach with --sharing=yes

> and get no connection. Error messages are below.
> Whats wrong? Any hints?
> 
> ---------------------------------------------
> output from: xpra shadow ssh:max at xxxxx.org:30
> ---------------------------------------------
> 
> 2017-12-28 19:07:28,614 Xpra gtk2 client version 0.17.6-r14322
That version is buggy as hell and full of security issues, do not use.

Cheers
Antoine