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Cannot establish connections using the Teredo protocolYou cannot use the FRITZ!Box's internet connection to establish connections using the Teredo protocol. As a result, you cannot use Windows Remote Assistance via Easy Connect or establish DirectAccess connections, for example. Cause For security reasons, the FRITZ!Box blocks UDP port 3544 when an IPv6 internet connection is active. This means...

Cannot play media filesTelevisions, game consoles, Blu-ray players, or other UPnP-compatible playback devices or software cannot play individual photos, videos, or music pieces from the FRITZ!Box media server. When you try to play them, the device may display the error message "not supported file format" or "unknown file format".1 Changing the file extension of MKV video files for use with Samsung...

Status information for a printer connected to the FRITZ!Box is not availableComputers in the home network cannot retrieve status information like ink or paper level for a printer when the printer is connected to the FRITZ!Box via USB cable and configured as a network printer.Status information is not available for USB network printersTwo-way communication (bidirectional connection) between the...

Online storage contains a folder "lost+found" with files that cannot be deletedThere is a folder named "lost+found" on the online storage configured in the FRITZ!Box with contents that cannot be deleted. When you try to delete this folder, the following or a similar error message is displayed: "You require permission from [...] to make changes to this file."Folder "lost+found" is a part of the...

FRITZ!Box USB remote connection reports "Debug Assertion Failed"When installing the FRITZ!Box remote connection software, the error message "Microsoft Visual C++ Debug Library: Debug Assertion Failed!" is displayed. Installation cannot be completed.Changing the computer name in the operating systemAccording to Microsoft's definition, computer names may only contain standard letters (A-Z, a-z),...

Can the FRITZ!Box USB remote connection be used over VPN?The FRITZ!Box remote connection software cannot be used to access USB devices connected to a remote FRITZ!Box over a VPN connection. The FRITZ!Box USB remote connection communicates with the FRITZ!Box via multicast and broadcast messages that are only transmitted within a local IP network. You therefore cannot use the FRITZ!Box USB remote...

Parental controls incorrectly block internet accessThe FRITZ!Box blocks a computer, smartphone, or another device from accessing the internet, although the device should have been able to access the internet at the time the error occurred. The following messages are displayed: In a web browser on the device: "Internet access is blocked." In the FRITZ!Box user interface: "Parental controls...