[Beowulf] Benchmarking?

Sean Dilda agrajag at dragaera.net
Sun Aug 22 05:59:07 PDT 2004

On Sat, 2004-08-21 at 23:13, Brandon Chow wrote:
> Hi Rajiv,
> I have the same problem on RedHat 9.  Set "ForwardX11"
> to "no" in /etc/ssh/ssh_conf file eliminates the
> warning.  I'm not sure what that option is for,
> however, seting it to no doesn't seem to break
> anything.  ssh connection time is alot faster after
> this change.

By default, when you ssh, ssh tries to set it up to forward back X
connections.  That way when you run an X app on the remote host, its
forwarded back to the originating host with the right X permissions, and
also over the ssh link so that you don't have to worry about leaving
extra ports open or setting X permissions.

However, if you don't have the X permissions setup properly when you
start your ssh, ssh can get confused.  That option tells the ssh client
not to attempt to forward X connections.  The same thing can be achieved
by calling 'ssh -x'.


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