This guide explains how to secure your SSH Server on Ubuntu to help prevent unauthorised users (hackers) accessing your server.
You should already have an SSH Server installed and running if you don’t install one now with:
apt-get install ssh
Now before I start you maybe wondering “Who would want to break into my SSH Server?” the answer is more than likely a Bot. Bot’s scan subnets of boxes with high bandwidth or those on government ranges (to look cool on IRC when then have a reverse DNS with something like nasa.gov or .mod). Once the Bot has compromised your machine it is added to a large network of other compromised computers which is controlled by the “Hacker”, the machines are then “normally” used to DDOS other sites offline, if you can Imagen the power of say 1000 hacked servers with 100 Mbp connections to the internet bombarding TCP connections at another server on the Internet, the result is downtime. The web server is overloaded with requests and the server is rendered useless causing you frustration, money, time, pain and a possible sacking. So bottom line secure your SSH Server and any other services for that matter and make sure you keep your servers up to date!
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