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Tuesday, January 22, 2008
 
UNIX/Linux: X11 connection rejected because of wrong authentication

 % ssh -X -l userid remotehost

remotehost% /usr/openwin/bin/xclock
X11 connection rejected because of wrong authentication.
X connection to localhost:10.0 broken (explicit kill or server shutdown).

If you encounter X11 connection rejected because of wrong authentication error after logging to an UNIX/Linux host through ssh with X11 forwarding option, -X, check your /etc/inet/hosts file for multiple localhost entries; and remove the unnecessary ones.

For example, my /etc/inet/hosts has the following entries when the xclock failed with an X11 connection rejected .. error.
remotehost% cat /etc/inet/hosts

127.0.0.1 localhost
::1 localhost
10.2.211.150 sunfiret2000 loghost

Removing the 2nd line, ::1 localhost, fixed the issue.
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Comments:
I'd be interested in hearing more about this bug. Is ssh using IPv6 to connect to the server?
 
No; IPv4, mrdeviant.
 
What versions of OpenSSH are running on the client and server? What does netstat say when you have the IPv6 localhost entry defined?
 
fixed my bug. could you please explain the reason behind it
 
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