class Net::LDAP::Connection

def open_connection(server)
  hosts = server[:hosts]
  encryption = server[:encryption]
  timeout = server[:connect_timeout] || DefaultConnectTimeout
  socket_opts = {
    connect_timeout: timeout,
  }
  errors = []
  hosts.each do |host, port|
    begin
      prepare_socket(server.merge(socket: @socket_class.new(host, port, socket_opts)), timeout, host)
      if encryption
        if encryption[:tls_options] &&
           encryption[:tls_options][:verify_mode] &&
           encryption[:tls_options][:verify_mode] == OpenSSL::SSL::VERIFY_NONE
          warn "not verifying SSL hostname of LDAPS server '#{host}:#{port}'"
        else
          @conn.post_connection_check(host)
        end
      end
      return
    rescue Net::LDAP::Error, SocketError, SystemCallError,
           OpenSSL::SSL::SSLError => e
      # Ensure the connection is closed in the event a setup failure.
      close
      errors << [e, host, port]
    end
  end
  raise Net::LDAP::ConnectionError.new(errors)
end