[PD] [rpi] X11 forwarding woes

[Andy Farnell]

Root cannot open a display owned by another user. Logging in as
user1 and then running a forwarded X application as user2 will fail
unless user2 can write to the same display. 

As for ssh, I think -X is deprecated in favour of -Y for many reasons

Also, why use ssh? Unless you are exposing the RPi directly to the internet
(It is a COW installed system, not a RO live system so could
be compromised), then why bother? The encrytion overhead is quite
a drag on bandwidth. At least turn the cipher to a lightweight
one like Blowfish. Otherwise, open the X using xhost and export
a display setting.

cheers,
Andy



On Mon, Jan 28, 2013 at 03:26:01PM +0100, Charles Goyard wrote:
> Hi list,
> 
> just starting using pd on the rpi. It works well, but there's something
> strange with X11 forwarding.
> 
> Doing:
> ssh -X 192.168.1.52
> pd
> 
> fails with :
> X Error of failed request:  BadAccess (attempt to access private
> resource denied)
> Major opcode of failed request:  18 (X_ChangeProperty)
> 
> Doing:
> ssh -Y 192.168.1.52
> pd
> 
> works.
> 
> Doing:
> ssh -Y 192.168.1.52
> sudo pd
> 
> fails with :
> debug2: X11 connection uses different authentication protocol.
> X11 connection rejected because of wrong authentication.
> Application initialization failed: couldn't connect to display "localhost:10.0"
> 
> 
> So far I'm not that concerned with real-time priority, but what's my problem ?
> I found some clues on the internet but they were not helpful.
> 
> Commands like xterm and wish and exported to my display as needed.
> 
> Thanks for any idea.
> 
> Charles
> 
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