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FRITZ!Box reports "The dynamic DNS update was successful, but an error occurred [...]"

It is not possible to access the FRITZ!Box or devices in the home network via the dynamic DNS domain name. One of the following error messages is displayed in the event log of the FRITZ!Box:

  • "Dynamic DNS error: The specified domain name cannot be resolved despite a successful update."
  • "Dynamic DNS error: The dynamic DNS update was successful, but an error occurred during the subsequent DNS resolution."

1 Entering the entire DynDNS domain name

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Permit Access" in the "Internet" menu.
  3. Click on the "DynDNS" tab.
  4. In the "Domain name" field, enter the entire domain name, for example For information on the format, refer to the dynamic DNS provider.
  5. Click "Apply" to save the settings.

2 DNS servers on the internet were not updated

Some DNS servers on the internet do not update the assignment of IP addresses to domain names immediately. As a result, for a while they still respond to requests addressed to dynamic DNS domain names with an old IP address, although the FRITZ!Box already notified your dynamic DNS provider of the new IP address. This behavior of the DNS servers cannot be influenced by the FRITZ!Box or your dynamic DNS provider.

Normally the problem resolves itself after a maximum of one hour when the relevant DNS servers on the internet are updated.