Thanx for all the help.

I have configured how to do this following the steps:

1. Set OS_AUTHENT_PREFIX:
SQL> ALTER SYSTEM SET OS_AUTHENT_PREFIX = "" SCOPE=SPFILE;

2. Set REMOTE_OS_AUTHENT:
SQL> ALTER SYSTEM SET REMOTE_OS_AUTHENT = TRUE SCOPE=SPFILE;

3. For Windows servers, set in the "%ORACLE_HOME%\network\admin\sqlnet.ora" file:
SQLNET.AUTHENTICATION_SERVICES= (NTS)

4. Restart database.

5. Create the users.
SQL> CREATE USER xx INDENTIFIED EXTERNALLY;