Is SSH Key Authentication Disabled?

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http://www.unix.com – I setup passwordless authentication on a Ubuntu vm by ssh'ing into the localhost. I'm trying to do the same thing on another machine but it's not working. I believe I have the permissions setup properly and keygen'd. Is there a way to disable passwordless authentication? I have permission to view / cat files like /etc/sshd_config...is there a specific line that will shut off key authentication? (HowTos)