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why when xlock is active, no new network connections are permitted?
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I think you are talking about X network connections. Presumably if you are locking X, you don't want any new X sessions. You can change this behaviour with appropriate combinations of the
remote and
allowaccess flags.
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why is it not a security hazard to use the killall command to end the xlock program?
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It is only a security hazard if you expect to use xlock to prevent all access to the machine... xlock doesn't add extra protection over the normal password authentication, it is just a useful way of locking the X session without having to log out.
