I am using a Windows 2008 Server as my LDAP server and on a Ubuntu 12.04 client I am trying to connect to it. I get the following error: nss_ldap: could not connect to any LDAP server as (null) - Can't contact LDAP server From my Ubuntu client I run the following: ldapsearch -h 10.1.1.251 -D admin -w password -s base dc=ad,dc=xxx,dc=com -p 389 and get the following success message # search result search: 2 result: 0 Success Any help would be greatly appreciated.