Whether the cable does not work now because of out of specification length or whether it is due to bad connectors, I do not know, in any case it does not work with my hardware.
Regardless of the technical problem: The cable was originally packed in shrink-wrapped blister, ie it was not a customer in hand and it is not returned goods. Nevertheless, it is greasy / sticky, and not just at one point but ringsrum over the entire length.
Conclusion: For me absolutely useless.
This cable Lindy I have in the meantime purchased Lindy Premium Firewire / IEEE1394 cable, 6 pin to 6 pin connector, 4.5 m, 800 Mbps comp.
In many cases, better quality and it worked perfectly straight away.