Exceed session freezes after a longer while

Hi there,
I have a strange situation here for last few weeks. Poeple are working
on their Ms Windows 2000 machines with Hummingbird Exceed 10.0.0.5 as X
servers. They are connecting via ssh to an AIX 5.2 machine, exporting
DISPLAY to their local Windows workstations and running our
application. Everything is working fine, but several times a day (today
it was like seven times) the session freezes and it's not possible to
do anything, but killing the session with `kill -9`.

In $HOME/.dt/errorlog I have:
Workspace Manager: I/O error on display:: frappc152:0.0

frappc152 is a Windows workstation. The screen saver is disabled in
/usr/dt/config/Xstartup:
/usr/X11R6/bin/xset -dpms
/usr/X11R6/bin/xset s off

Do you have any idea where is the clue? Our firewall team checked
everything, both machines stand in one location, the network works just
fine, in general. Nothing in Hummingbird's support area. Is it
dt-related or Exceed-related or what?

Sincerely,
Lukasz

--
Lufthansa Systems Aeronautics
Frankfurt, Germany

.

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