Bug in remote gui app execution via cygwin sshd

[Harmon Nine]

Hello.

 

Platform:   Windows XP

Package:   Cygwin openssh

 

There appears to be a bug in the ssh-daemon in version 5.8p1-1 of the

openssh package for cygwin.  The bug does not present itself on systems
running

sshd from the 5.1p1-10 version of cygwin openssh.

 

The bug is as follows:

A remote system R has Cygwin sshd running from version 5.8p1-1 of

openssh.  The daemon is running as a service, configured using
ssh-host-config.

Further, the service is running under the "Local System account", and in

its properties as a service, "Allow service to interact with desktop"

has been checked.

 

A user on a local machine logs into R using ssh.  Then, in the resulting

shell, the user executes a gui app such as notepad.  On the remote

machine R, what appears on the display, rather than the gui for the

notepad app, is a rectangular area with what appears to be a title-bar

at the top, although what this bar contains is a long white or

multi-colored rectangle.   The "window" itself displays the contents of

what was behind it when it was spawned, and keeps displaying this when

moved.  Beyond the ability to move it, the rectangle is non-functional.

 

If R is running sshd from version 5.1p1-10 of cygwin openssh, with the
same

configuration, a functional notepad app is spawned.

 

This doesn't appear to be due to any windows updates, as we have updated

all of our machines recently.  Those with 5.8p1-1 have the bug, and

those with 5.1p1-10 do not.

 

Any help/information is appreciated.

 

-- Harmon