Это не загадочность, да хотел глянуть права на этот файл. Так, теперь еще , в качестве клиента у вас какая ОС, win/linux? из под какого терминала запускаете?
2.7 - X11 and/or agent forwarding does not work.
Check your ssh_config and sshd_config. The default configuration files disable authentication agent and X11 forwarding. To enable it, put the line below in sshd_config:
X11Forwarding yes
and put the following lines in ssh_config:
ForwardAgent yes
ForwardX11 yes
X11 forwarding requires a working xauth(1) binary. On OpenBSD this is in the xbase file set but will probably be different on other platforms. For OpenSSH Portable, xauth must be either found at configure time or specified via XAuthLocation in sshd_config(5) and ssh_config(5).
Note on agent interoperability: There are two different and incompatible agent forwarding mechanisms within the SSH2 protocol. OpenSSH has always used an extension of the original SSH1 agent requests, however some commercial products use a different, non-free agent forwarding protocol. This means that agent forwarding cannot be used between OpenSSH and those products.
NOTE: For users of Linux Mandrake 7.2, Mandrake modifies the XAUTHORITY environment variable in /etc/skel/.bashrc, and thus any bash user's home directory. This variable is set by OpenSSH and for either of the above options to work, you need to comment out the line:
# export XAUTHORITY=$HOME/.Xauthority
Тогда читаем рук-во по использованию openssh 
FAQ SSH
XDMCP-HOWTO
forwarding
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MS Windows 10
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