title: ORA-12170: TNS:Connect timeout occurred
body: <p>I was trying to connect to the database here in my laptop using Oracle Toad but I kept on having this error:</p>
  
  <blockquote>
    <p>ORA-12170: TNS:Connect timeout occurred</p>
  </blockquote>
  
  <p>What are the possible reasons why I kept on having this error? </p>
  
  <p>I accessed the same database yesterday and was able to accessed it.</p>