You ping with your windows command console.
(Windows Vista, 7, 8)
Therefore click "start" and type in "cmd" - right-click the console cmd.exe and type in ping YOUR DDNS including the portnumber (for example: ping myhost.dyndns.org:80)
If anything works fine and your router doesnt block the ping-command you should get 1 line with your IP adress and 4 lines with the response time.
After this please check if the ipadress is the same than your external ip-adress.
If it is then ddns works fine.
Otherwise maybe you have a firewall blockung your transfer between web an your profilux.
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