It seems that you're not inputing the right password. Check the setup on your Diginet site, the standard password is 1234. Diginet is really touchy when it comes to changing sitecodes or passwords. I'd recommend to use the given site code (100-001) and just change the password. Another way to check is to use Diginet centre and try to connect from there. For your IP field you would use the domain you created through Dyndns. And your router should have DMZ disabled if you're using DynDns. Hope it helps.
