openssh unix dev - Mar 2017 - Why windows from 2nd server can not be shown when an intermediate ssh server is used?

Hi,

Suppose I have three linux servers A, B and C.

On A, I run `ssh -Y B` to login to B (programs using windows on B can
be shown on A). Then, I login to C from B using the command `ssh -Y
C`. But, programs in can not show windows on A.

Does anybody know how to let A show windows from C? Thanks.

-- 
Regards,
Peng

On Mon, Mar 13, 2017 at 3:18 AM, Peng Yu <pengyu.ut at gmail.com>
wrote:
> Suppose I have three linux servers A, B and C.
>
> On A, I run `ssh -Y B` to login to B (programs using windows on B can
> be shown on A). Then, I login to C from B using the command `ssh -Y
> C`. But, programs in can not show windows on A.
>
> Does anybody know how to let A show windows from C? Thanks.
My guess is that C either has X11Forwarding disabled in its
sshd_config or it does not have the xauth binary (or it's not where
sshd expects and XAuthLocation is not set).

If those are not the case please post a debug log from the client on B
(ie ssh -Y into B then ssh -vvv C".

-- 
Darren Tucker (dtucker at zip.com.au)
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860  37F4 9357 ECEF 11EA A6FA (new)
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.