There are several script kiddies out there hitting my SSH server every day. Sometimes they attempt to brute-force their way in trying new logins every second or so for hours at a time. Given enough time, I fear they will eventually get in. Is there anything I can do to hinder them?
I'd like to ban the IP after 50 failed attempts or something. I'd heard that each failed attempt from a source was supposed to make the daemon respond slower each time, thus limiting the usefulness of brute force attacks, but I'm not seeing that behavior.
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