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* Avoid using packages from unknown sources. | * Avoid using packages from unknown sources. | ||
* Use a recent image. For example, don't use Ubuntu 14.04 when Ubuntu 16.04 is available. | * Use a recent image. For example, don't use Ubuntu 14.04 when Ubuntu 16.04 is available. | ||
* | * Use [https://docs.computecanada.ca/wiki/SSH_Keys SSH key] authentication instead of passwords. | ||
* Install [https://www.fail2ban.org fail2ban] to block brute-force attacks. | * Install [https://www.fail2ban.org fail2ban] to block brute-force attacks. | ||