Airport Extreme and DYNDNS problem - TESSERAX PLEASE READ THIS

Good evening to all.
I've a problem with the configuration of an airport base station with dynamic DNS.
I followed the advice of TESSERAX here, but without success: airport does not connect to DynDNS and does not update the IP address.
https://discussions.apple.com/docs/DOC-3413
Days ago I was able to run DYNDNS but with completely different parameters, as described here (scroll to the middle, at the chapter: "Setup Your Dynamic Global Hostname in the AirPort or Time Capsule") :
http://dyn.com/support/airport-time-capsule-with-dynamic-dns/#setup-apple-airpor t
Unfortunately, after making some changes in the airport configuration (which is abolutely not related to the DYNDNS), this has stopped updating the IP. I've tried to restore the configuration, reflash ecc but without success.
This is my configuration:
- PC Windows XP-SP3 running AirPort Utility 5.5.3 (FWIW there is an annoying bug that prevents you from writing the dot "." in the hostname field, the only solution is to use the copy-paste).
- AirPort Extreme with 7.6 firmware ( 7.6.1 also available but I've read that isn't much better)
I also own an AirPort Express 2nd gen with 7.6.2 firmware, I've tried to use this in the place of airport extreme but idem, no success.
So, please please please HELP ME. Thanks everyone, Damiano

Hello Tesserax, happy to read you.
Yes, I referred to the part #2 of your guide but I've also read many of your other posts about it. In fact, let me thank you for your willingness, it's people like you that make the web a better place.
I also spent a good part of the night reading all the other threads on DynDNS but without success.
As for my DynDNS account, this is obviously a free account. The host name is like "<pc-name>.dyndns.org" as the user name using my email address (with or without domain "@ gmail.com" works anyway).
Click here to see a screenshot: http://i33.servimg.com/u/f33/16/33/96/86/dyndns13.jpg
In desperation, I also called a friend who lent me his Netgear modem/router, which supports DynDNS: well, it was enough to enter hostname, username and password so that everything started to work perfectly.
I am truly saddened
There's also an odd thing I don't understand: if I press the CTRL key and EDIT simultaneously in the AirPort window, appear three other fields... What are these?
Click here to see a screenshot: http://i33.servimg.com/u/f33/16/33/96/86/airpor10.jpg
Thanks in advance for all the help you'll give me. Damiano

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