ORA-28271: No permission to read user entry in LDAP directory service.
Cause : ORACLE server does not have read permission on user nickname's X.500 user entry.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Make sure ORACLE server is using right SSL credentials to connect to LDAP directory services. Make sure permissions for LDAP user entries are right.
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.