While one-time passwords sent to a mobile device are subject to Man-in-the-Middle(MITM) attacks, using any second factor is better than no second factor. One of the most common second factor authentication examples is a combination of a passphrase the user knows and a one-time password sent to their mobile device. In second factor authentication, sometimes called two-factor authentication, a system requires two different forms of authentication to gain access. In this article, we’ll explore five SSH best practices you should observe to boost the security of your infrastructure. Although SSH is the industry standard for both security and efficacy for remote server access, as with any software, SSH is only as secure as configurations applied to the server and client configurations. # and ChallengeResponseAuthentication to 'no'.Strictly following security best practices is the first step to cybersecurity. # PAM authentication, then enable this but set PasswordAuthentication # If you just want the PAM account and session checks to run without # the setting of "PermitRootLogin without-password". # PAM authentication via ChallengeResponseAuthentication may bypass # be allowed through the ChallengeResponseAuthentication and If this is enabled, PAM authentication will # Set this to 'yes' to enable PAM authentication, account processing, # Change to yes to enable challenge-response passwords (beware issues with # To disable tunneled clear text passwords, change to no here! # Don't read the user's ~/.rhosts and ~/.shosts files # Change to yes if you don't trust ~/.ssh/known_hosts for # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts ssh/authorized_keys2 to be disregarded by default in future. # OpenSSH is to specify options with their default value where # The strategy used for options in the default sshd_config shipped with # This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin # This is the sshd server system-wide configuration file. The config file is like this # $OpenBSD: sshd_config,v 1.103 9 20:41:22 tj Exp $ May 20 21:45:13 xxx sshd: Failed password for invalid user xyxyxy from 132.203.102.34 port 36004 ssh2 May 20 21:45:10 xxx sshd: pam_sss(sshd:auth): received for user xyxyxy: 17 (Failure setting user credentials) May 20 21:45:10 xxx sshd: pam_sss(sshd:auth): authentication failure logname= uid=0 euid=0 tty=ssh ruser= rhost=132.203.102.34 user=xyxyxy May 20 21:45:10 xxx sshd: pam_unix(sshd:auth): authentication failure logname= uid=0 euid=0 tty=ssh ruser= rhost=132.203.102.34 user=xyxyxy I checked /var/log/auth.log and somehow it says my password is bad, but it's nonsense because the password still works for sudo. After that I tried to use Pubkey, which I think I succesfully set it up but it didn't connect again. Then I tried to connect again on another terminal but it didn't accept my password. And the I updated/upgraded because it has been while since I upgraded. I connected my remote server through ssh, which is Ubuntu.
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