LDAP TLS negotiation failure error

Q. I am trying to configure LDAP client. Have copied the certificate to client and enabled TLS in pam_ldap.conf. Still the client failed to communicate with LDAP server. At server end found TLS negotiation failure error. How to fix it?

Sep 11 10:35:12 rhel4 slapd[5241]: conn=1130 fd=12 ACCEPT from IP=10.20.31.140:37309 (IP=0.0.0.0:636)
Sep 11 10:35:12 rhel4 slapd[5241]: conn=1130 fd=12 closed (TLS negotiation failure)

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