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I'm having problems forwarding X11 with my test machine I recently successfully (Other than this issue...) upgraded from Mepis 8.0 to 8.5. It was all working fine before the upgrade and I made sure the sshd_config file I was using was maintained but I keep getting cannot open display and/or cannot connect to server messages when I try to start an app remotely. I can ssh onto the box without issues but the forwarding thing has me stumped. I'm not sure if it's a KDE4 issue or something trivial I've overlooked...
I think I might be onto something... I added -v to an attempt to ssh onto my machine. Amongst the debug was a line that said no xauth program. After a bit of Googling, I found that sshd looks for xauth in /usr/bin/X11/xauth. The thing is, xauth seems to be there... Any thoughts?
# $OpenBSD: sshd_config,v 1.38 2001/04/15 21:41:29 deraadt Exp $
# This sshd was compiled with PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
# This is the sshd server system-wide configuration file. See sshd(8)
# for more information.
AllowUsers sshl0gin firstname.lastname@example.org.*
# Don't read ~/.rhosts and ~/.shosts files
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#obsoletes QuietMode and FascistLogging
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
# similar for protocol version 2
# To disable tunneled clear text passwords, change to no here!
# Uncomment to disable s/key passwords
# Uncomment to enable PAM keyboard-interactive authentication
# Warning: enabling this may bypass the setting of 'PasswordAuthentication'
# To change Kerberos options
# NB: Debian's ssh ships without Kerberos Support
# Kerberos TGT Passing does only work with the AFS kaserver
Subsystem sftp /usr/lib/openssh/sftp-server