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From: <Robert DOT Atwood AT diamond DOT ac DOT uk>
To: <cygwin AT cygwin DOT com>
Subject: RE: After updating Cygwin installation  on 29-05-2015 , cygwin-x server does   not accept ssh x11 forwarding any more
Date: Fri, 29 May 2015 17:49:41 +0000
Message-ID: <6CCDD8FC6578314C902BBF87D511D9D89B211304@EXCHMBX01.fed.cclrc.ac.uk>
References: <6CCDD8FC6578314C902BBF87D511D9D89B211236 AT EXCHMBX01 DOT fed DOT cclrc DOT ac DOT uk>	<33284267 DOT 20150529200559 AT yandex DOT ru>
In-Reply-To: <33284267.20150529200559@yandex.ru>
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> -----Original Message-----
> From: Andrey Repin [mailto:anrdaemon AT yandex DOT ru]
> Sent: 29 May 2015 18:06
> To: Atwood, Robert (DLSLtd,RAL,SCI); cygwin AT cygwin DOT com
> Subject: Re: After updating Cygwin installation on 29-05-2015 , cygwin-x
> server does not accept ssh x11 forwarding any more
> 
> Greetings, Robert DOT Atwood AT diamond DOT ac DOT uk!
> 
> > After updating Cygwin installation  on 29-05-2015 , cygwin-x server
> > does not accept ssh x11 forwarding any more.
> > I do not modify the configuration files.
> > I generally start Xwin server using the icon, launch a console to
> > remote server using Putty configured with X11 forwarding, then launch X11
> program from that console.
> 
> > Now I find that if I start Xwin by xinit, run ssh from inside the Xwin
> > terminal box , even then it does not work, the connection  of Prior to
> > today it was always working , and has been for several years.
> 
> > What has changed ?
> 
> X server not listening on TCP anymore, to begin with.


Thanks for clarifying that. However, I lack the technical knowledge to interpret this correctly.
 A long time ago I used to use insecure X-window without ssh forwarding and in that case it was necessary
 to listen on tcp for incoming X connections from another machine, I have no idea that the local-end of the ssh tunnel
 actually uses tcp on the local host? Is that what's happening? 
 
Using -listen tcp only works now if I also install xhost and then use xhost + which seems extreme? 

At least it demonstrates that it is authorization and not some other problem.


I am afraid that searching had turned up rather instances of people's virus software interfering. 


> Please use search, you're, like, fifth to ask this question.

The only clue is in 
https://sourceware.org/ml/cygwin/2015-05/msg00152.html
But, it's not very clear about what the change is, or when it occurred. 

As I say , that does not immediately work for me, until I think back to insecure clusters (why bother if it is not connected to the internet?)  of many years ago  and try xhost + 


But several other results 
https://sourceware.org/ml/cygwin/2015-05/msg00220.html

https://sourceware.org/ml/cygwin/2015-05/msg00188.html

are unrelated it seems. 


> 
> http://cygwin.com/ml/cygwin/2015-05/msg00019.html
> 
> > [kny48981 AT i12-ws011 ~]$ xeyes
> > debug1: client_input_channel_open: ctype x11 rchan 3 win 65536 max
> > 16384
> > debug1: client_request_x11: request from ::1 49318
> > debug1: channel 1: new [x11]
> > debug1: confirm x11
> > debug1: channel 1: free: x11, nchannels 2 Invalid MIT-MAGIC-COOKIE-1
> > keyError: Can't open display: localhost:13.0
> > [kny48981 AT i12-ws011 ~]$
> 
> 
> 
> --
> With best regards,
> Andrey Repin
> Friday, May 29, 2015 20:03:24
> 
> Sorry for my terrible english...


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