auth       required     /lib/security/pam_nologin.so
auth       sufficient    /lib/security/pam_ldap.so
auth       required     /lib/security/pam_unix_auth.so try_first_pass
account    sufficient   /lib/secuirty/pam_ldap.so
				 ^^
				 These wovels are reversed

account    required     /lib/security/pam_unix_acct.so
password   required     /lib/security/pam_cracklib.so
password   sufficient   /lib/security/pam_ldap.so
password   required     /lib/security/pam_pwdb.so use_first_pass
session    required     /lib/security/pam_unix_session.so

Because of this typos in the path of pam_ldap.so, the authentication
fails.