title: Reg: sysdba not logging, system user and other user connecting
body: <p>Sysdba not logging other users are logging below,   how to</p>
  <p>fix it, able to login to other users successfully, please find below, only with sysdba not working</p>
  <pre><code> [oracle@dztupbin]$ ./sqlplus SYSTEM/&quot;oracle&quot;
    
      SQL*Plus: Release 12.2.0.1.0 Production on Thu Apr 28 11:05:09 2022
      Copyright (c) 1982, 2016, Oracle.  All rights reserved.
      Last Successful login time: Thu Apr 28 2022 11:05:00 +01:00
      Connected to:
      Oracle Database 12c Standard Edition Release 12.2.0.1.0 - 64bit Production
      
      [oracle@dztup bin]$ ./sqlplus SYSTEM/&quot;oracle&quot;  as sysdba
      
      SQL*Plus: Release 12.2.0.1.0 Production on Thu Apr 28 11:05:18 2022
      
      Copyright (c) 1982, 2016, Oracle.  All rights reserved.
      
      ERROR:
      ORA-01017: invalid username/password; logon denied
      
      
      Enter user-name:
  </code></pre>
  <p>sqlplus / as sysdba also giving same result:-</p>
  <p>./sqlplus / as sysdba</p>
  <pre><code>ERROR:
  ORA-01017: invalid username/password; logon denied
  
  
  
  
  [oracle@dztup bin]$ ./sqlplus /  as sysdba
  
  SQL*Plus: Release 12.2.0.1.0 Production on Thu Apr 28 11:05:18 2022
  
  Copyright (c) 1982, 2016, Oracle.  All rights reserved.
  
  ERROR:
  ORA-01017: invalid username/password; logon denied
  
  
  Enter user-name:
  </code></pre>
  <p>I connected to sys user now:-</p>
  <pre><code>[oracle@dztup bin]$ ./sqlplus system/&quot;oracle&quot;
  
  SQL*Plus: Release 12.2.0.1.0 Production on Thu Apr 28 13:25:51 2022
  
  Copyright (c) 1982, 2016, Oracle.  All rights reserved.
  
  Last Successful login time: Thu Apr 28 2022 13:25:15 +01:00
  
  Connected to:
  Oracle Database 12c Standard Edition Release 12.2.0.1.0 - 64bit Production
  
  SQL&gt; conn sys as sysdba
  Enter password:
  Connected.
  SQL&gt;
  SQL&gt;
  SQL&gt;
  SQL&gt; show user
  USER is &quot;SYS&quot;
  </code></pre>
  <p>granted sysdba privilige to system user now able to connect:</p>
  <p>but still sqlplus / as sysdba not working.
  [oracle@dztup bin]$ ./sqlplus /  as sysdba</p>
  <p>SQL*Plus: Release 12.2.0.1.0 Production on Thu Apr 28 11:05:18 2022</p>
  <p>Copyright (c) 1982, 2016, Oracle.  All rights reserved.</p>
  <p>ERROR:
  ORA-01017: invalid username/password; logon denied</p>