I can't connect with an user by externally !

I created 2 users, one identified by password he can connect and an another one identified by externally on Redhat 9, he can't connect, there is the error :
[franck_at_DBA franck]$ sqlplus /

SQL*Plus: Release 9.2.0.1.0 - Production on Mon Jan 5 17:59:38 2004

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

ERROR:
ORA-01017: invalid username/password; logon denied

Enter user-name:

until the account lock !

in initSID.ora, I put :
remote_os_authent = TRUE
os_authent_prefix = ""

there is something wrong or something miss me !

thanks to help me Received on Mon Jan 05 2004 - 11:10:34 CST