[FreeNX-kNX] Re: Fedora 14 black screen

[Fritz Elfert]

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On 28.04.2011 16:30, Mario Ceresa wrote:
> Hey Chris,
> 
> I solved the problem!
[...]
> exec /usr/bin/ssh-agent $SHELL
> 
> Commenting it out did the magic. Any idea why it interferes with NX?
> It works with local or ssh login.

Because your way of using ssh-agent from a .profile (or .bashrc or any
*sourced* script) is completely wrong. It *replaces* the currently
running shell by a second shell which is started from ssh-agent. The
currently running shell is always terminated, because you use exec. So
it just *looks* like it works if you login directly. However even with a
direct login, any settings made before that line (in the invoking shell;
e.g. an alias definition) are lost. The correct way (for a bourne-like
shell) is something like this:

SSHAGENT=/usr/bin/ssh-agent
SSHAGENTARGS="-s"
if [ -z "$SSH_AUTH_SOCK" -a -x "$SSHAGENT" ]; then
   eval `$SSHAGENT $SSHAGENTARGS`
   trap "kill $SSH_AGENT_PID" 0
fi

More examples here:
http://mah.everybody.org/docs/ssh#run-ssh-agent
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