Security in Three Ds: Detect, Decide and Deny
Mar 18, 2015, 11:00 (0 Talkback[s])
Whenever a server is accessible via the Internet, it's a safe bet that hackers will be trying to access it.
Just look at the SSH logs for any server you use, and you'll surely find lots of "authentication failure" lines, originating from IPs that have nothing to do with you or your business. Brute-force attempts (such as "dictionary attacks") try different passwords over and over to try to get into your box, and there's always a chance that they eventually will succeed.