MyFRITZ!App Service - Knowledge Base
MyFRITZ!App reports "A server with the specified host name could not be found [-1003]"
MyFRITZ!App does not display the MyFRITZ! home page of your FRITZ!Box. When it attempts to log onto the FRITZ!Box, MyFRITZ!App displays the error message "A server with the specified host name could not be found [-1003]".
Public IP address required for access
You can only use MyFRITZ!App to access the FRITZ!Box from the internet if your internet service provider assigns the FRITZ!Box a public IPv4 address or an IPv6 when it establishes an internet connection.
Important:When used on an internet connection with DS-Lite tunnel, the FRITZ!Box is only accessible over IPv6 and not over IPv4. If a DS-Lite tunnel is enabled, this is displayed under "Connections" on the "Overview" page of the FRITZ!Box user interface.
You cannot access the FRITZ!Box if the FRITZ!Box obtains a private IPv4 address.
If the FRITZ!Box obtains an IPv6 address in addition to the private IPv4 address, then the FRITZ!Box can be reached at this IPv6 address. However, access over the IPv6 address is only possible if the smartphone or tablet itself is also connected to the internet via IPv6 and obtains an IPv6 address.
Since not all internet connections support IPv6 connectivity (for example in many mobile communication networks and wireless hotspots), call up www.test-ipv6.com or www.ipv6-test.com on your smartphone or tablet to test IPv6 connectivity. You can only access the FRITZ!Box with MyFRITZ!App if IPv6 connectivity is available.