Error Message:
$ su – oracle
oracle’s Password:
3004-619 Security method “LDAP” could not be loaded.

3004-501 Cannot su to “oracle” : Account is not accessible.
Solution:
Add the following entry in file /etc/methods.cfg

LDAP:
program = /usr/lib/security/LDAP
program_64 =/usr/lib/security/LDAP64