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When you add or update a custom URL for DynamicDNS, the field outline goes red and produces an error.
Teltonika's instruction for using DYNU (https://wiki.teltonika-networks.com/view/Dynu.com_DDNS_configuration) it uses the custom URL - http://api.dynu.com/nic/update?hostname=[DOMAIN]&myip=[IP]&username=[USERNAME]&password=[PASSWORD]. As I am using aliases I have to have add &alias=[ALIAS] to the URL which has worked on previous versions of the firmware.
The new firmware does not like the [ in the URL field. As soon as you include this in the URL it red borders the field and produces an error on Save.
This does in fact seem like an unnecessarily restrictive URL validation. I'll report this issue to our RnD team.
For now, a workaround could be used:
uci set ddns.myddns.update_url='http://api.dynu.com/nic/update?hostname=[DOMAIN]&myip=[IP]&username=[USERNAME]&password=[PASSWORD]&alias=[ALIAS]'
This should allow you to overcome the WebUI limitation.
Let me know if any more help is needed!