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Subject: Re: X: Authorization required, but no authorization protocol specified
To: Markus Hoenicka <markus DOT hoenicka AT mhoenicka DOT de>, cygwin AT cygwin DOT com
References: <67ea3d1202eccadc3fc21e58af6ca4bf AT mhoenicka DOT de> <55C479DA DOT 7000203 AT dronecode DOT org DOT uk> <114144297d60607a3c87f5fd63fb555a AT mhoenicka DOT de>
From: Jon TURNEY <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID: <55CB6480.6080905@dronecode.org.uk>
Date: Wed, 12 Aug 2015 16:21:36 +0100
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On 12/08/2015 07:22, Markus Hoenicka wrote:
> At 2015-08-07 11:26, Jon TURNEY was heard to say:
>> You might try modifying startxwin to remove the -q from xauth -q to
>> see if that reveals a bit more information.
>
> I finally got round to run this suggested test too. The first time I try
> to start X I get the following output:
>
> $ XAUTHORITY="" startxwin /usr/bin/emacs
> Using authority file /home/<username>/.serverauth.1076
> Writing authority file /home/<username>/.serverauth.1076
> Using authority file /home/<username>/.Xauthority
> Writing authority file /home/<username>/.Xauthority
> xauth:  file /home/<username>/.Xauthority does not exist
> xauth:  file /home/<username>/.Xauthority does not exist
> Using authority file /home/<username>/.Xauthority
> Writing authority file /home/<username>/.Xauthority

> Could this be a timing issue while writing to a network drive? Remember
> that we use roaming profiles here.

Yes, I think that the fact it's a network drive is the significant 
difference.

But the failure seems utterly crazy. xauth is used to write a file, and 
then moments later another instance of xauth claims it doesn't exist.

I've no idea if this is a problem with xauth, cygwin or your networked 
file system.  Do you know what kind of device the network share is on?

There was another report of some problems with xauth and network file 
system (see the thread starting at [1]), but the symptoms seem very 
different.  Nevertheless you might like to try with xauth -i to see if 
the behaviour is any different.

Possible workarounds:

You could edit /usr/bin/startxwin to change 'enable_xauth' to 0, or set 
the XAUTHORITY env var to a local path

[1] https://cygwin.com/ml/cygwin/2015-03/msg00398.html

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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