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Date: Wed, 11 Apr 2001 20:31:50 -0700
From: Enoch Wu <ewu AT eskimo DOT com>
To: Clive Butler <Clive DOT E DOT Butler AT usa DOT alcatel DOT com>
Cc: cygwin AT cygwin DOT com
Subject: Re: "Cannot open display" or XDMCP problem ?
Message-ID: <20010411203150.C4053139@MELON>
Reply-To: Enoch Wu <ewu AT eskimo DOT com>
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	Clive Butler <Clive DOT E DOT Butler AT usa DOT alcatel DOT com>, cygwin AT cygwin DOT com
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In-Reply-To: <009d01c0c299$5d7e0a60$262acdc6@va.alcatel.com>; from Clive.E.Butler@usa.alcatel.com on Wed, Apr 11, 2001 at 11:09:11AM -0400
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On Wed, Apr 11, 2001 at 11:09:11AM -0400, Clive Butler wrote:
> 
> I had a similar problem with XDMCP on Windows98 where
> the XDMCP message from XWin to the XDMCP server
> contained 0.0.0.0 as the (first) display address, or else
> contained no address at all. The XDMCP server would either
> reject the client message or would blindly use 0.0.0.0 as
> the display address.
> 
> The reason for this is that the XFree86 XDMCP client code
> enumerates all the local IP addresses to put into the XDMCP
> message, and it turns out that the cygwin 1.1.8 code for this
> doesn't take unused network interfaces or DHCP-configured
> interfaces into account on Windows9x.
> 
> If you provide "-from" on the Xwin command line, the server will
> still enumerate the local IP addresses, but will discard all the ones
> that don't match the "-from" parameter. This should work for
> you UNLESS you are using DHCP to configure your IP address.
> 
> If you are using DHCP, a workaround might be to re-configure
> the interface with a static IP address that matches the one
> given by DHCP.
>
Do you exclude PPP?
 
> The development version of cygwin looks to have fixed this
> problem.
> 
> 
Excellent! So your recommendation is for people to download Harold's
Test 16 XWin and Sidiqqi's Cygwin/XFree in the xc directory.

EW


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