title: java.sql.SQLException: Io exception: Unknown host specified
body: <p>I have a server name, port number, database name, domain, username, and password.
  I entered the connection string using the below format:</p>
  
  <pre><code>jdbc:oracle:thin:@//serverName:portNumber//domain
  </code></pre>
  
  <p>But got the below error:</p>
  
  <blockquote>
    <p>java.sql.SQLException: Io exception: Unknown host specified </p>
  </blockquote>
  
  <p>How do I specify the connection string ?</p>