title: Groundwork / Nagios' check_by_ssh is returning "Remote command execution failed"
body: <p>I'm using Groundwork / Nagios, and I'm trying to set up check_by_ssh. Right now, the command is:</p>
  
  <blockquote>
    <p>$USER1$/check_by_ssh -i
    ~nagios/.ssh/id_dsa -H $HOSTADDRESS$
    -t 60 -l "$USER24$" -C "/tmp/test"</p>
  </blockquote>
  
  <p>where /tmp/test is a Hello World program.</p>
  
  <p>but it's returning the message 
  <code>"Remote command execution failed:********************************************"</code></p>
  
  <p>I have ssh keys set up for nagios to log into <code>$HOSTADDRESS$</code> as <code>$USER24$</code>, but I'm still getting the error. (The private key is in ~nagios/.ssh on the groundwork box, and the public key is in ~/$USER24$/.ssh on the remote host)</p>
  
  <p>So basically, check_by_ssh is failing to run any program.</p>