Unwanted disconnections of X clients - cygwin 64 - version 2.874

[Jean-Paul Bouchet <jean-paul.bouchet@avignon.inra.fr>]

Hello,

We use Cygwin for a few years to give access to linux servers to users 
from their windows PC.
We use xlaunch to launch Xwin and open X11 remote sessions via XDMCP.
Our linux server launches on Cygwin/X a client to let users 
authentificate themselves and open a session on the linux server. Once 
connected, gdm3 opens a session combining a set of clients and 
permitting the users to open the applications they need.

This works correctly on several pc of our local network with various 
versions of cygwin, such as:
- version 2.859 of cygwin (installation: 16/01/2015) - 32 bits
- version 2.870 of cygwin (installation: 24/04/2015) - 64 bits

With recent versions, at least  2.873 or 2.874, we observe that :
- the login client is closed and relaunched every 2 to 5 minutes
- the session, once opened, is closed and all clients killed every 2 to 
5 minutes, independently of the activity of the user (he may work or 
not), as if the PC was disconnected. The login client is displayed again 
after each disconnection.

Nothing abnormal appears in the log file of cygwin, nor in the windows 
events and errors files.

On the linux server, some errors are notified in the .xsession-errors of 
the user: Fatal IO error 11 (Ressource temporairement non disponible) on 
X server

  x-session-manager[4139]: Gdk-WARNING: x-session-manager: Fatal IO 
error 11 (Ressource temporairement non disponible) on X server 
147.100.68.164:0.
(gnome-settings-daemon:4200): Gdk-WARNING **: gnome-settings-daemon: 
Fatal IO error 11 (Ressource temporairement non disponible) on X server 
147.100.68.164:0.
(gnome-terminal:4473): Gdk-WARNING **: gnome-terminal: Fatal IO error 11 
(Ressource temporairement non disponible) on X server 147.100.68.164:0.0.
Avertissement du gestionnaire de fenêtres : Erreur fatale d'E/S 11 
(Ressource temporairement non disponible) sur le visuel 
« 147.100.68.164:0 ».
g_dbus_connection_real_closed: Remote peer vanished with error: 
Underlying GIOStream returned 0 bytes on an async read 
(g-io-error-quark, 0). Exiting.
g_dbus_connection_real_closed: Remote peer vanished with error: 
Underlying GIOStream returned 0 bytes on an async read 
(g-io-error-quark, 0). Exiting.
g_dbus_connection_real_closed: Remote peer vanished with error: 
Underlying GIOStream returned 0 bytes on an async read 
(g-io-error-quark, 0). Exiting.
Received signal:15->'Complété'
(nm-applet:4254): Gdk-WARNING **: nm-applet: Fatal IO error 11 
(Ressource temporairement non disponible) on X server 147.100.68.164:0.
(gdu-notification-daemon:4257): Gdk-WARNING **: gdu-notification-daemon: 
Fatal IO error 11 (Ressource temporairement non disponible) on X server 
147.100.68.164:0.
(gnome-screensaver:4281): Gdk-WARNING **: gnome-screensaver: Fatal IO 
error 11 (Ressource temporairement non disponible) on X server 
147.100.68.164:0.

May be, on the linux server, the session manager fails to read or write 
something on the X server running on the PC or to receive some data he 
has asked, and decides to close the session. But what ?

On the same PC, when I try to compare permissions on folders like /tmp, 
/tmp/.X11-unix, /var/run, /var/tmp, ..., between the recent version with 
disconnection problems and an older one without these problems, I notice 
many differences. But I don't know whether they are or not in relation 
with the problem and it doen't seem judicious to apply a few limited and 
punctual modifications, rather than a script rationally solving 
permission problems.

I have not found on cygwin archives recent contributions about similar 
problems.
Have someone met similar problems and found how to solve them ?

Best regards,

Jean-Paul Bouchet
Institut National de la Recherche Agronomique - Centre de Provence, 
Alpes, Côte d'Azur
UR 1052 <http://w3.avignon.inra.fr/gafl/en> - Génétique et Amélioration 
des Fruits et Légumes
Domaine Saint-Maurice - CS 60094 - F-84143 Montfavet cedex - France
E-mail : <mailto:Jean-Paul.Bouchet@avignon.inra.fr>



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