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I recently noticed a LOT of ssh-agent processes running on my system (CentOS 4.2). It seems that the ssh-agent gets started before the session manager (in /etc/X11/xinit/xinitrc-common) which is great. The only problem is that the agent process does not die when the session shuts down. I run ssh-add in my session startup to get my key loaded into ssh-agent, so that might be part of the issue.