Sysadmins have begun noticing a coordinated attack on servers with open SSH ports that tries to stay under the radar by only attempting to guess a password three times from any compromised machine. Instead of mounting an attack form a single compromised host, hackers have worked out a means to relay a brute force attack between multiple assault machines. Do you have SSH open on your Linux machine? If so make sure that all your user's passwords are strong. Check out your system logs and see if attackers are trying to guess your passwords.

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