X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:date:message-id:mime-version
	:content-type:content-transfer-encoding; q=dns; s=default; b=fxD
	s/ifz7kFNu3Ktf8rsX9rOabdleXN/6nJPLrWJMZB42LaOkXO57Bjg47lEBPx32+r
	yJq5C1lJ1/t4ZtP9QYU3yU65YOBk7r0ukD2GqfvoUPzcRrjmQ6x8fP52OrcCwvCN
	N+4+A0Mg064Y546pzyTtLfUJEnNRPWdwytwgnjyc=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:date:message-id:mime-version
	:content-type:content-transfer-encoding; s=default; bh=qLdaOCODm
	bb4OVQ/iDtdJhNFy6c=; b=yRlTaNRpoqC7If4IUaWp7LJe5h80noou7Zr7TfhSh
	qGNoVz0OUjkw9chVGkgZZHM0gj7gA95F5LpHkmNjMFpaeuWaOrVJPrmqY3iv6g2f
	WMUiobDKp05/xHHOtXPjlrE5H12Syy0Vc+CTNM7LEG0KWh6yuRWv696kp02eJT3p
	I0=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=0.3 required=5.0 tests=AWL,BAYES_00,FSL_HELO_BARE_IP_2,RCVD_IN_DNSWL_LOW,RCVD_NUMERIC_HELO,SPF_HELO_PASS,SPF_PASS,T_RP_MATCHES_RCVD autolearn=no version=3.3.2
X-HELO:	plane.gmane.org
To:	cygwin AT cygwin DOT com
From:	Andrew DeFaria <Andrew AT DeFaria DOT com>
Subject:	X11Forward and xauth problems
Date:	Mon, 23 Mar 2015 13:48:57 -0700
Lines:	52
Message-ID:	<mepu7q$9dr$1@ger.gmane.org>
Mime-Version:	1.0
User-Agent:	Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0
X-IsSubscribed:	yes

Normally I just turn on -X (or put X11Forward yes in ~/.ssh/config) but 
that usually results in a noticeable delay in logging in and the 
following error:

Warning: untrusted X11 forwarding setup failed: xauth key data not generated
Warning: No xauth data; using fake authentication data for X11 forwarding.
/usr/bin/xauth:  unable to link authority file 
/home/adefaria/.Xauthority, use /home/adefaria/.Xauthority-n
Cm-app-ldev01:

I've asked about this in the past and I think the answer was that the 
message was correct but you shouldn't worry about it. If it didn't slow 
me down I probably would just ignore it. But it slows me down. So I ssh 
instead without X11Forward turned on then, when I need to run an X 
client, I do export DISPLAY=adefaria-lt:0 and make sure that I did an 
xhost + there at least once. But now that's broken!

Adefaria-lt:xhost +
access control disabled, clients can connect from any host
Adefaria-lt:ssh cm-app-ldev01
Cm-app-ldev01:export DISPLAY=adefaria-lt:0
Cm-app-ldev01:xclock
Error: Can't open display: adefaria-lt:0
Cm-app-ldev01:

I still don't understand xauth but I've been playing with it and I can 
sometimes get it to work.

Adefaria-lt:rm ~/.Xauthority*
Adefaria-lt:ssh -X cm-app-ldev01 xclock
Warning: untrusted X11 forwarding setup failed: xauth key data not generated
Warning: No xauth data; using fake authentication data for X11 forwarding.
/usr/bin/xauth:  creating new authority file /home/adefaria/.Xauthority
Adefaria-lt:ssh -X cm-app-ldev01 xclock
Warning: untrusted X11 forwarding setup failed: xauth key data not generated
Warning: No xauth data; using fake authentication data for X11 forwarding.
/usr/bin/xauth:  unable to link authority file 
/home/adefaria/.Xauthority, use /home/adefaria/.Xauthority-n
X11 connection rejected because of wrong authentication.
Error: Can't open display: localhost:12.0
Adefaria-lt:

The first ssh to cm-app-ldev01 to run xclock works fine. Do it again and 
it fails.

Ideal solution: ssh -X works with no warnings or musings about .Xauthority.

Workable solution(s): Either that ssh -X complains about .Xauthority but 
still reliably puts up X clients or I can use xhost + and export DISPLAY.
-- 
Andrew DeFaria
http://defaria.com


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -