#1268
Oracle – Remote/External access as sysdba
1.Set the database parameter REMOTE_LOGIN_PASSWORDFILE = { shared | exclusive | none }
2. Check/Create a password file at location $ORACLE_HOME/dbs/ with command :
$ORACLE_HOME/bin/./orapwd file=$ORACLE_HOME/dbs/orapw<YOUR SID> password=syspass
3. Restart DB
Oracle 12C The Oracle system identifier ” already exists, specify another SID