title: (psycopg2.OperationalError) SSL error: certificate verify failed
body: <p>I am trying to use Sqlalchemy package to be able to connect to Redshift datawarehouse. </p>
  
  <pre><code>from sqlalchemy import create_engine
  import psycopg2
  
  
  red_engine=create_engine('redshift+psycopg2://admin:XXXXXXXXX@IP:PORT/DBNAME')
  
  test = pd.read_sql_query(query,red_engine)
  </code></pre>
  
  <p>Error message I get is :</p>
  
  <pre><code>OperationalError: (psycopg2.OperationalError) SSL error: certificate verify failed
  </code></pre>
  
  <p>I am unable to see why this SSL veirifcation is falling all, used to go smoothly earlier. </p>