title: ORA-12514 TNS:listener does not currently know of service requested in connect descriptor
body: <p>We have an application running locally where we're experiencing the following error:</p>
  
  <blockquote>
    <p>ORA-12514: TNS:listener does not currently know of service requested
    in connect descriptor</p>
  </blockquote>
  
  <p>I've tested the connection using <code>TNSPing</code> which resolved correctly and
  I tried <code>SQLPlus</code> to try connecting, which failed with the same error as above. I used this syntax for <code>SQLPlus</code>:</p>
  
  <pre><code>sqlplus username/password@addressname[or host name]
  </code></pre>
  
  <p>We have verified that:</p>
  
  <ul>
  <li>the TNS Listener on the server is running. </li>
  <li>Oracle itself on the server is running. </li>
  </ul>
  
  <p>We don't know of any changes that were made to this environment. 
  Anything else we can test?</p>