title: errror when trying to run rds cli commands
body: <p>I have the following error when trying to run the rds cli command, I have looked and cannot find anything related which describes why I am getting this error:</p>
  
  <pre><code>rds rds-describe-db-instances
  rds-describe-db-instances:  Refused: Signature expired: 20160721T013819Z is now earlier than
   20160721T151824Z (20160721T153324Z - 15 min.)
  </code></pre>
  
  <p>I am trying to extract logs from the RDS instance, In the past I was able to extract the logs successfully, The credentials have not changed. </p>
  
  <p>Any idea why I am getting this issue?</p>