title: How to block strange HTTP requests from AWS ELB
body: <p>I have a bunch of strange logs on Cloudwatch coming from ALB, looks like this.</p>
  <pre><code>2020-11-03T14:52:57.289+09:00 Not Found: /owa/auth/logon.aspx
  
  2020-11-03T15:23:20.120+09:00 Not Found: /.env
  
  2020-11-03T15:35:39.482+09:00 Not Found: /index.php
  
  </code></pre>
  <p>I use cloudwatch to logging server data, so this really bothers me. I would like to know how to block them.</p>