title: Listener failed to start
body: <p>I have a virtual Machine on VMWare Player: Oracle 11g on Linux Centos.
  Since I haven't used it for 2 years, I don't remember almost anything,and when I try to startup the db it says listener is down, and when I try to start listener it says:</p>
  
  <pre><code>TNSLSNR for Linux Version 11.2. 0.1.0 - Production
  System Parameter file is /oracle/product/11gR2/network/admin/listener.ora
  Log messages written to /oracle/diag/tnslsnr/srvlinux/listener/alert/log.xml
  Error listening on: (ADRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
  TNS-12542: TNS:address already in use
   TNS-12560: TNS:protocol adater error
    TNS-00512: Address already in use
     Linux Error: 98: Address already in use
  </code></pre>
  
  <p>What do I have to configure exactly? Thanks in advance.</p>
  
  <p>EDIT:</p>
  
  <p>netstat -tulpn | grep :1521</p>
  
  <pre><code>tcp 0 0 :::1521 :::* LIST 
  EN 3369/tnslsnr
  </code></pre>
  
  <p>EDIT:</p>
  
  <p>lsnrctl status</p>
  
  <pre><code>LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 11-DEC-2012 16:09:54
  </code></pre>
  
  <p>sqlplus / as sysdba</p>
  
  <pre><code>ERROR:
  ORA-12162: TNS:net service name is incorrectly specified
  </code></pre>