XForwarding problem

[Predrag Punosevac]

Denny White wrote:
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> On Thu, Feb 28, 2008 at 02:46:41AM -0700, Predrag Punosevac sez:
>   
>> Denny White wrote:
>>
>>     
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>>> For the last couple of days I've tried everything I can think of to
>>> make XForwarding work with ssh. As per the FAQ, I have set it like so:
>>>
>>>
>>> In sshd_config
>>>
>>> X11Forwarding yes
>>>
>>>
>>> In ssh_config
>>>
>>> ForwardAgent yes
>>> ForwardX11 yes
>>>
>>> I can use it passably well in one direction from a box across the
>>> room to the one I do most of my work on. But, when I try it from
>>> this box to the one across the room, I get the xauth error message
>>> along with all typed characters doubled on the screen. I went ahead
>>> anyway and typed 'display somefile.jpg' just to see what I'd get &
>>> got this:
>>>
>>> Xlib: connection to "localhost:10.0" refused by server
>>> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
>>> display: unable to open X server `localhost:10.0'.
>>>
>>> I've read the man page on xauth(1) and experimented with its
>>> commands. I've even wiped out the .Xauthority file on both boxes
>>> and restarted X, to no avail. Possibly I should mention too, that
>>> I boot on both boxes to a xdm login. I don't know if that would
>>> have any bearing on the problem or not. Thanks for any help I
>>> can get on this.
>>>       
>> What happens when you try to do the following?
>>
>>
>> Try to do remote login with as follows
>> ssh -Y username at remotehost.dns
>>     
>
> I get this:
>
> Warning: No xauth data; using fake authentication data for X11
> forwarding.
>
> And, everything I type at the prompt is doubled.
>  
>   
>> you should be now in the shell on the remote host
>>
>> try to start x client like xdvi or xfig or something like emacs by 
>> typing xdvi
>>
>> If xdvi pops up that means that the client is running on the remote host 
>> but it is displayer on the local X server
>>     
>
> Okay, if after getting in I try to open something like xzgv, I get:
>
> Xlib: connection to "localhost:10.0" refused by server
>   
Ok you do have a permission problem

Read carefully man pages for sshd_config  file .  You need to uncomment 
few lines for X tunneling.
You can also look at the "Secure Architectures with OpenBSD" section 
about OpenSSH.

I do not think that the problem is with X server though.
Best,
Predrag



> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
>
> Gtk-WARNING **: cannot open display: localhost:10.0
>  
> Like I said earlier, I read the man page too on xauth & tried
> sending
>
> xauth extract - $DISPLAY | rsh otherhost xauth merge -
>
> but it doesn't appear to help. I still get the error messages
> and double typed characters.
>
>