Help: How do you connect sys as sysdba in sqlplus

We have a 9i on linux which we need to connect sys as sysdba in sqlplus on windows, but when I started the Sqlplus dialog window and enter sys as sysdba, or I started at DOS window and enter C:/> sqlplus /nolog
SQL> connect sys as sysdba
Enter Password:
ERROR:
ORA-12560: TNS:protocol adapter error

If I do

SQL> conn sys/manager as {sysdba}
SP2-0306: Invalid option.
Usage: CONN[ECT] [logon] [AS {SYSDBA|SYSOPER}] | [INTERNAL] where <logon> ::= <username>[/<password>][@<connect_string>] | / SQL> connect internal
ERROR:
ORA-24314: service handle not initialized

The init.ora has the remote_login_passwordfile=EXCLUSIVE could somebody tell me how can I connect remotely using 'sys as sysdba'?

Thanks for your help

We are using sqlplus 8.1.7.0.0  

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