Remote password file

Source your db profile . .SID

enter orapwd

Usage: orapwd file= entries= force= ignorecase= nosysdba=

  where

    file - name of password file (required),

    password - password for SYS will be prompted if not specified at command line,

    entries - maximum number of distinct DBA (optional),

    force - whether to overwrite existing file (optional),

    ignorecase - passwords are case-insensitive (optional),

    nosysdba - whether to shut out the SYSDBA logon (optional Database Vault only).

   

  There must be no spaces around the equal-to (=) character.

orapwd file=$ORACLE_HOME/dbs/orapw$ORACLE_SID entries=5 force=y ignorecase=y nosysdba=n

Enter password for SYS:xxxxxxx

after completed.

you can see the orapwSID file find in ORACLE_HOME/dbs/orapwSID

shutdown your database   and add the entry in your initSID.ora

remote_login_passwordfile='EXCLUSIVE'

to check 
select * from v$pwfile_users;