DynDNS DDNS update fails

[pxwm-steve]

Running TS-253 Pro
4.3.6.0805 Firmware
Latest app updates

We have changed ISP and trying to get DynDNS service working for remote login as no longer have a static IP.
We have a dyn.com account that provides a username, password, access key, and hostname, and allows for update via URL.
We added a DDNS entry under Access Services using the default DynDNS template and tried with both username/password and username/key, neither of these worked and produced a 'failed to update DDNS' error message.
This is using the default DynDNS template on the QNAP:

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https://members.dyndns.org/v3/update?hostname=%HOST%&myip=%IP%

Next we created a custom DDNS service using the URL authentication structure recommended by Dyn, and tried with both username/password and username/key:

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https://%USER%:%PASS%@members.dyndns.org/v3/update?hostname=%HOST%&myip=%IP%

This failed with the same error message.
Following that we tried manually putting all variables directly into the URL, which failed with the same message.

Pasting this URL directly into a browser comes up with the message 'good' followed by the correct IP and updates the DynDNS record, so the URL and authentication are correct and the Dyn service is responding correctly.

Setting the IP manually in DynDNS allows correct remote access and all adaptor settings appear correct.

DDNS is showing the correct external IP address, but it would appear that something is happening within the DDNS service that means it is not sending the correct URL.

Is there anything further that we could do to test or to resolve this?

[h1ghju1ce]

dont know if you ever fixed this, but I found your post before I just managed to fix it myself

Oracle bought Dyn, and changed the update URL (and QNAP didnt update their templates to reflect the change)

This article explains whats changed
https://help.dyn.com/remote-access-api/perform-update/

You need your "Updater Client Key" from your profile details page:
https://account.dyn.com/profile/

on the QNAP Create a custom DDNS (I called mine DynDNS-Key)

put your username in the USER box
in the PASS box, put your "CLIENT KEY" in that box

use this as the URL

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https://%USER%:%PASS%@members.dyndns.org/v3/update?hostname=%HOST%&myip=%IP%