- How to Disable Direct Root Login to SSH on Ubuntu

One security tweak you need to consider is with Open-SSH server. By default, direct log on for root is enabled, which means your just asking for trouble with hackers attempting to break into your Computer. Instead, you can easily disable root access from logging into your SSH server,

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source:http://linuxpoison.blogspot.com/2010/12/135781677519888.html