title: install sshd using cygwin
body: <p>I want to use cygwin to install sshd in windows. But when I start the sshd service, it says:</p>
  
  <pre><code>The CYGWIN sshd service is starting.
  The CYGWIN sshd service could not be started.
  The service did not report an error.
  More help is available by typing NET HELPMSG 3534.
  </code></pre>
  
  <p>And the <code>sshd.log</code> says:</p>
  
  <pre><code>Permissions 0660 for '/etc/ssh_host_dsa_key' are too open.
  It is required that your private key files are NOT accessible by others.
  This private key will be ignored.
  bad permissions: ignore key: /etc/ssh_host_dsa_key
  Could not load host key: /etc/ssh_host_dsa_key
  </code></pre>
  
  <p>So how to deal with it?</p>