[X2Go-User] x2godesktopsharing Connection error No protocol specified xwininfo: error: unable to open display ":0"

Víctor J. Sánchez vjosesan at gmail.com
Thu Jun 29 17:33:23 CEST 2017


Hi all,

I'm trying to connect to an existing user session (local desktop mode) 
to help him in a remote host using x2godesktopsharing feature but I 
always get the next error (the first is in spanish):

Error en la conexión No protocol specified xwininfo: error: unable to 
open display ":0" No protocol specified xwininfo: error: unable to open 
display ":0"

The scenario is:

- Remote host: Linux Mint 18.1 x64, Plasma 5 session, nopasswordlogin 
user and unprivileged (user A) logged in, X2Go Desktop Sharing running 
and enabled, administrator (sudoer) user B included in group 
x2godesktopsharing

x2goversion:

x2goagent: 3.5.0.32 x2godesktopsharing: 3.1.1.3 x2goserver: 4.0.1.20 
x2goserver-printing: 4.0.1.20 x2goserver-xsession: 4.0.1.20

- Local host: Fedora 25 Workstation x64, Plasma 5 session

x2goversion:

cups-x2go: 3.0.1.3 x2goagent: 3.5.0.32 x2goserver: 4.0.1.20 
x2goserver-extensions: 4.0.1.20 x2goserver-fmbindings: 4.0.1.20 
x2goserver-printing: 4.0.1.20 x2goserver-xsession: 4.0.1.20

Client X2Go v. 4.1.0.0 (Qt - 4.8.7)

I also tested on a local host with Windows 10 X2Go client and the error 
is the same. However other connection types (terminal or published 
applications) work fine. I've also tried with another remote sessions: 
XFCE, Cinnamon, ... the same result.

Also I've observed that if the remote user A executes in a terminal 
window the "xhost +" command, when the user B connects to remote host 
with local desktop mode a window to choose a desktop is presented but 
only appears "non-existent" user B sessions (user B, screen :0) instead 
of user A session.

What's wrong here?

Thanks for your support.

Regards.

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