[CentOS] X11 connection rejected because of wrong authentication

Mon Nov 25 13:50:47 UTC 2013
James B. Byrne <byrnejb at harte-lyne.ca>

On Sun, November 24, 2013 20:08, Timothy Murphy wrote:
> I'd like to run SELinux on my CentOS server in enforcing mode,
> but I get the above message when I run sealert.
> I assume this is because I am accessing the server from my laptop?
> In any case, I googled for the message,
> and this threw up dozens of similar queries over many years.
> Most of the ones I read offered methods of avoiding the problem
> rather than solving it.
> Am I right in thinking the message arises from my remote connection?

Yes. It arises from your ssh connection.  You are probably using the -Y or -X
option with xauth.

> And if so, is there a simple solution?

Perhaps.  The error you have is caused by one of two things: 1. incorrect
SELinux settings on the ~/.Xauthority file or your home directory. Run
restorcon -vR ~ to fix those.  2. incorrect ownership or permissions on

The second condition can also be triggered by logging in via ssh as one user
and su -l to another on the remote host.  In my case I find that the second
circumstance is the most frequent cause of the exact error you report.


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