title: How to connect to memcached server from outside?
body: <p>I installed memcached on AWS EC2 Ubuntu, and I can connect it by <code>telnet</code> in the server:</p>
  
  <pre><code>telnet localhost 11211
  </code></pre>
  
  <p>But how can I connect it from other machine? I know the interval ip is 172.31.17.208, but when I try to connect it from another EC2 by:</p>
  
  <pre><code>telnet 172.31.17.208 11211
  </code></pre>
  
  <p>the response is </p>
  
  <pre><code>Could not open connection to the host, on port 11211: connect failed.
  </code></pre>