External authenticated user

Any ideas for below???

I have set up external authenticated user rajeshext I can log on use "sqlplus /" but I can not log on using "sqlplus /@ORA10G". Any ideas?

[rajeshext_at_fedora ~]$
[rajeshext_at_fedora ~]$
[rajeshext_at_fedora ~]$ . /usr/local/bin/oraenv
ORACLE_SID = [rajeshext] ? ORA10G
[rajeshext_at_fedora ~]$ sqlplus /

SQL*Plus: Release 10.1.0.2.0 - Production on Thu Jul 6 18:51:40 2006

Copyright (c) 1982, 2004, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production With the Partitioning, OLAP and Data Mining options

SQL> quit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
[rajeshext_at_fedora ~]$ sqlplus /@ORA10G

SQL*Plus: Release 10.1.0.2.0 - Production on Thu Jul 6 18:51:49 2006

Copyright (c) 1982, 2004, Oracle. All rights reserved.

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

Enter user-name: Received on Thu Jul 06 2006 - 19:25:13 CDT