pam-ldap multiple ldap servers is not working

Hi All,

I have the following packages for the ldap
openldap-2.3.27-8
openldap-devel-2.3.27-8
python-ldap-2.2.0-2.1
nss_ldap-253-5.el5
openldap-clients-2.3.27-8

I am trying to get pam authentication working, it is working good. The
issue now is if I put multiple ldap servers by host ldap1.test.com,
ldap2.test.com in /etc/ldap.conf and /etc/openldap/ldap.conf file. and
in the iptables block response from ldap1.test.com, the authentication
will not success. I checked tcpdump, pam-ldap will consult
ldap1.test.com and ldap2.test.com, but the prompt for the client is
just password, password prompt, it will never authenticate.

Any insight is greatly appreciated.

Schilling