Hello,
im facing with an issue on my new Cisco router with a DDNS update.

Model and spec below.

Cisco IOS XE Software, Version 17.09.05a
Cisco IOS Software [Cupertino], ISR Software (ARMV8EL_LINUX_IOSD-UNIVERSALK9-M), Version 17.9.5a, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2024 by Cisco Systems, Inc.
Compiled Mon 12-Feb-24 11:59 by mcpre


Cisco IOS-XE software, Copyright (c) 2005-2024 by cisco Systems, Inc.
All rights reserved. Certain components of Cisco IOS-XE software are
licensed under the GNU General Public License ("GPL") Version 2.0. The
software code licensed under GPL Version 2.0 is free software that comes
with ABSOLUTELY NO WARRANTY. You can redistribute and/or modify such
GPL code under the terms of GPL Version 2.0. For more details, see the
documentation or "License Notice" file accompanying the IOS-XE software,
or the applicable URL provided on the flyer accompanying the IOS-XE
software.


ROM: 17.7(2r)

Isr1k3-mi uptime is 13 minutes
Uptime for this control processor is 14 minutes
System returned to ROM by Reload Command
System image file is "bootflash:c1100-universalk9.17.09.05a.SPA.bin"

----------------------------------configuration--------------------------------------------

ip ddns update method dynu.com
HTTP
add http://api.dynu.com/nic/update?hostname=vpnhub.ddnsfree.com&password=internetddns
interval maximum 0 0 1 0

interface Dialer0
ip ddns update hostname vpnhub.ddnsfree.com
ip ddns update dynu.com


----------------------------------debug/log--------------------------------------------


*May 15 2025 17:37:53 GMTSumm: HTTPDNS: Update add called for vpnhub.ddnsfree.com <=> 151.64.155.75
*May 15 2025 17:37:53 GMTSumm: HTTPDNSUPD: Session ID = 0xF
*May 15 2025 17:37:53 GMTSumm: HTTPDNSUPD: URL = 'http://api.dynu.com/nic/update?hostname=vpnhub.ddnsfree.com&password=internetddns'
*May 15 2025 17:37:53 GMTSumm: HTTPDNSUPD: Sending request
*May 15 2025 17:37:53 GMTSumm: HTTPDNSUPD: Call returned Request Failed, update of vpnhub.ddnsfree.com <=> 151.64.155.75 failed
*May 15 2025 17:37:53 GMTSumm: DYNDNSUPD: Another update completed (outstanding=0, total=0)
*May 15 2025 17:37:53 GMTSumm: HTTPDNSUPD: Clearing all session 15 info

Im just test another free DDNS service successfully, please help me I LOVE DYNU at all.

Thanks Fabio