title: How to connect to newly installed Oracle XE instance?
body: <p>I have installed Oracle XE on Win7 x64 machine. Installation completed successfully without problem, or perhaps installer didn't tell about them. But after installation I can't connect to database; its web interface is not working. I have looked through list of open ports, and there is no 8080 port as was noted during installation. Also I can't connect via SQLPlus.</p>
  
  <pre><code>SQL&gt; connect SYSTEM
  Enter password:
  ERROR:
  ORA-12638: Credential retrieval failed
  </code></pre>
  
  <p>Somewhere in the web it was told to edit <code>sqlnet.ora</code> file, I have changed it in the following way: </p>
  
  <pre><code># SQLNET.AUTHENTICATION_SERVICES = (NTS)
  SQLNET.AUTHENTICATION_SERVICES = (NONE)
  </code></pre>
  
  <p>and now I get next error</p>
  
  <pre><code>SQL&gt; connect SYSTEM
  Enter password:
  ERROR:
  ORA-01034: ORACLE not available
  ORA-27101: shared memory realm does not exist
  </code></pre>
  
  <p>What do I need to change so that I can connect to it?</p>