I just started experimenting with the DynDNS service of namecheap.com. It looks like the UTM thinks the update failed, although it succeeded.
UTM says:
DynDNS status is: The last update attempt failed.
DynDNS modified: Thu Jan 1 01:00:00 1970
Namecheap DNS says:
A-Record for a certain subdomain was successfully updated with the correct dynamic IP.
Is anybody having the same issue? [:S]