FRITZ!Box 6490 Cable Service - Knowledge Base

FRITZ!Box 6490 Cable Service

Cable Internet connection drops frequently

The Internet connection between your FRITZ!Box and your cable provider drops frequently (several times a day). When this occurs, the "Power" LED on the FRITZ!Box flashes and stays lit as soon as the Internet connection has been re-established. The following error message is displayed in the event log of the FRITZ!Box:

  • "Cable Internet not responding (no synchronization)
    Cable Internet synchronization starting (training)"


  • The stability of the cable Internet connection depends on the condition and the quality of the cable connection. Faults in the cabling or problems with the line can also affect it.

1 Checking the event log of the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Event Log" in the "System" menu.
  3. Check whether there are events listed that occurred before and while the error occurred, or whether there are only events that occurred after the error occurred.
    • If events that occurred before and while the error occurred are also displayed:
      • Proceed with the following section.
    • If only events that occurred after the error are displayed:

2 Checking the cabling

Mistakes in the cabling can often be overlooked. Therefore, make sure that the FRITZ!Box is correctly connected to your line:

  • Use the coaxial cable included with delivery to connect the FRITZ!Box directly to the first multimedia socket. If a cable technician performed the original installation, use the coaxial cable (without an extension) provided by the technician to connect the FRITZ!Box with the multimedia socket used by the technician.

3 Contacting your provider

There may be a problem with the cable connection or the coaxial cable may be damaged:

  • Contact your cable provider for a solution.