<li>Append the newly-created <code>identity.pub</code> file to <code>~root/.ssh/authorized_keys</code> (or the appopriate <code>~username/.ssh/authorized_keys</code>) on the remote machine(s).
<li>Some new SSH v2 implementation accept v2 style keys only. Use the <code>-t</code> option to <a href="http://www.tac.eu.org/cgi-bin/man-cgi?ssh-keygen+1">ssh-keygen</a>, and append the created <code>id_dsa.pub</code> or <code>id_rsa.pub</code> to <code>~root/.ssh/authorized_keys2</code> (or the appopriate <code>~username/.ssh/authorized_keys</code>) on the remote machine(s).
<li>You may need to set <code>PermitRootLogin without-password</code> (meaning with keys only) in your <code>sshd_config</code> file on the remote machine(s).
+ <li>You may want to set <code>ForwardX11 = no</code> in <code>~root/.ssh/config</code> to prevent spurious errors if your distribution turns on X11 forwarding by default.
</ul>
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