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System user login fails if ldap goes down.

Hi,

I have configured a mixed authentication systems (LDAP + System Users).
On this system some users are configure to login via ldap rest as system users.
I observed that if the ldap server goes down, system users also not able to login.
Is there any way to prevent this, following my pam configuration.

system-auth :

auth        required      pam_env.so
auth        sufficient    pam_unix.so nullok try_first_pass
auth        requisite     pam_succeed_if.so uid >= 500 quiet
auth        sufficient    pam_ldap.so use_first_pass
auth        required      pam_deny.so

account     required      pam_unix.so broken_shadow
account     sufficient    pam_succeed_if.so uid < 500 quiet
account     [default=bad success=ok user_unknown=ignore] pam_ldap.so
account     required      pam_permit.so

password    requisite     pam_cracklib.so try_first_pass retry=3 debug minclass=4 dcredit=-1 ucredit=-1 ocredit=-1 lcredit=0 minlen=8
password    sufficient    pam_unix.so md5 shadow nullok try_first_pass use_authtok
password    sufficient    pam_ldap.so use_authtok
password    required      pam_deny.so

nsswitch.conf
---------------------
passwd:     files ldap
shadow:     files ldap
group:      files ldap

I get following errors in syslog, even after proving correct password.

sshd[23564]: nss_ldap: failed to bind to LDAP server ldap://10.0.119.36/: Can't contact LDAP server
sshd[23564]: nss_ldap: reconnecting to LDAP server (sleeping 32 seconds)...
sshd[23568]: pam_ldap: ldap_simple_bind Can't contact LDAP server
sshd[23568]: Failed password for testuser from 1.2.3.4 port 33324 ssh2
sshd[23571]: fatal: Access denied for user testuser by PAM account configuration


Regards,

Meghanand N. Acharekar