John Newman wrote:
> Every Win32 X-server I've tried has the following problem: when the network
> connection between it and the Linux host exporting the display (connected to
> via xdmcp + gdm|xdm|kdm|whatever) drops for just a few seconds the X server
> crashes and all the clients obviously die too. This is not a problem
> if I'm connecting to a remote server from a Linux machine (i.e. XFree86
> -broadcast or XFree86 -query). The network can go down briefly, everything
> is completely unresponsive, and then it comes back alive when the network
> comes back up.
>
> The windows machines I'm trying this from are all Windowx XP Pro. The
> X servers I've tried are Exceed's, X-Win32 and Cygwin's XFree86 port XWin.
>
> Thanks if anyone has any pointers. I need this to work because my
> engineers find it unacceptable that a brief network glitch will kill their
> session.
>

From a posting to the exceed user group
(http://www.hummingbird.com/exceedusers/index.html) ...



Hello,
Slow or short loss of network connections tend to drop X clients. If there
is a prolonged delay in the transmission of packets, MS TCP will
timeout and
close the connection. This results in Exceed's X windows either dropping or
"hung" on the screen

Taken from the Windows 95 Resource Kit:

Hkey_Local_Machine\System\CurrentControlSet\Servic es\VxD\MSTCP

MaxDataRetries = 32-bit number (This value is to be added to the Parameters
key)

Specifies the maximum number of times a segment carrying data or an FIN
will
be retransmitted before the connection is aborted. The retransmission
timeout itself is adaptive and will vary according to link conditions. The
default is 5.

You will have to experiment with this number to get the best results. Start
with 10 and increase the value until the X app is able to recover without
hanging or dropping connection.

Thanks,

Anna Nagorny
Research & Development Support
Hummingbird Communications LTD
Tel: (416) 496-2200 Ext. 2342
Fax: (416) 496-7624
Email: anna@hcl.com
Web Site: www.hummingbird.com
Anonymous FTP: ftp.hcl.com



--
Chuck Dillon
Senior Software Engineer
NimbleGen Systems Inc.

John Newman writes:
> Thanks if anyone has any pointers. I need this to work because my
> engineers find it unacceptable that a brief network glitch will
> kill their session.

You can sidestep the problem by running a VNC server on a *nix box and
running VNC clients. Even after rebooting my W2K PC I can resume my X
session hosted on a Linux server.
--
Pete Forman -./\.- Disclaimer: This post is originated
WesternGeco -./\.- by myself and does not represent
pete.forman@westerngeco.com -./\.- opinion of Schlumberger, Baker
http://petef.port5.com -./\.- Hughes or their divisions.