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The most I know about securing a Linux vps I picked up from this: http://feross.org/how-to-setup-your-linode/ . If there is an ultimate resource on how to start securing a *nix vps then please do let me know. If I knew what to search for I could but a lot of this is unknown unknowns to me.

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After having fixed a sudo user (and confirm it works!), please also disable PermitRootLogin by setting it to 'no'.

Restart ssh after editing sshd_conf.

If you're squeemish, run dropbear on another port so you can log into your machine in case you made a boo-boo configuring openssh.

Also, more resources for security settings:

https://benchmarks.cisecurity.org/downloads/multiform/index....

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