I am trying to configure Active Directory authentication to SUSE Linux Enterprise Server 11 (x86_64) sever, but somehow we are not able to succeed. in warn file logs are showing error message "nss_ldap: could not search LDAP server - Server is unavailable".. and I am able to do the ldapsearch from SUSE server with same user.

I used yast to configure LDAP client.. does anyone has any idea why we getting this?

below lines are from messages file..

suselx01 sshd[13631]: Invalid user <user name> from 14.x.x.x
suselx01 sshd[13633]: pam_ldap: ldap_search_s Operations error
suselx01 sshd[13631]: error: PAM: User not known to the underlying authentication module for illegal user <user name> from 14.x.x.x
suselx01 sshd[13631]: Failed keyboard-interactive/pam for invalid user <user name> from 14.x.x.x port 61072 ssh2
suselx01 sshd[13637]: Accepted keyboard-interactive/pam for root from 14.x.x.x port 61073 ssh2
suselx01 sshd[13635]: pam_unix2(sshd:auth): conversation failed
suselx01 sshd[13635]: pam_ldap: ldap_search_s Operations error
suselx01 sshd[13635]: error: ssh_msg_send: write