this post was submitted on 12 Oct 2023
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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If I'm bruteforcing a server and each time that I try an username/password my IP gets banned but suddenly one combination allows me to do 4-5 test ( any bigger number than previously) you are potentially telling me that this user is different (it exists) than the previous ones. Therefore you are doing the attack easier for me because now I know which users actually exist in the machine. It doesn't matter if you are locking the attacker after the password was given.
As others told you, using public key auth, non standard ports or even port knocking will be much more useful.