For ntp connections, check your router status, there should have a reading about your isp DNS 1 and 2. you need have DNS 1 and 2 copy over to your dcs-920 network setting. save and reboot.
For dlinkddns, if you register under www.dlinkddns.com, try changing www.dyndns.org instead of www.dlinkddns.com for your Server Address. You notice that you can login with your dlinkddns account at dyndns.org