We are fail to search users from Windows Server 2003 Active Directory using PHP, although search is working with DN having 2 levels OU, but when we add another OU it simply stop searching and produce error: error number = -1, error msg = Can't contact to LDAP Server. $base_dn = "OU=Users,OU=xyz,DC=abc,DC=com,DC=pk"; // working $base_dn = "OU=All users,OU=COK,OU=Users,DC=abc,DC=com,DC=pk"; // Actual path Not working syed.arsalan