[Samba] Member server not authenticating against Samba BDC

[mallapadi niranjan]

Dear sir,

We have a samba PDC with master LDAP server , with samba version being
3.0.21, on PDC.
we have configured BDC with slave LDAP server  and samba version being
3.0.21 on PDC.
We have a Confiugred another linux system having samba 3.0.10 as Domain
Member server for Domain.
when the PDC is up, all the users are able to acces the member server
but when the PDC is down, the users are able to login to domain but unable
to access the Member server..

The error is "There are currently no logon servers available to service the
request".

Please guide me

Regards
niranjan