title: ssh: connect to host x.x.x.x port 22: Operation timed out
body: <p>I'm trying to ssh from mac into ubuntu</p>
  
  <p>this is the error msg I got:</p>
  
  <pre><code>OpenSSH_5.9p1, OpenSSL 0.9.8x 10 May 2012
  debug1: Reading configuration data /etc/ssh_config
  debug1: /etc/ssh_config line 20: Applying options for *
  debug2: ssh_connect: needpriv 0
  debug1: Connecting to 192.168.0.10 [192.168.0.10] port 22.
  ssh: connect to host 192.168.0.10 port 22: Operation timed out
  </code></pre>
  
  <p>What does it mean?</p>