sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.1.0 - Production on Thu Sep 11 14:58:49 2014
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR:
ORA-12545: Connect failed because target host or object does not exist
Enter user-name:
sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.1.0 - Production on Thu Sep 11 14:58:49 2014
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR:
ORA-12545: Connect failed because target host or object does not exist
Enter user-name: