We cannot get a connection with the ECU via the laptop (SQ6M 01E-500720), we have switched off the firewall and the TCP / Ipv 6 disabled, but nothing seems to work.we have tried several laptops but also this without success.

The only thing we now doubt is whether the cable that came with the car is the right cable, could help someone.
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EOT will always be blocked by firewall.  Be sure you go to firewall settings and allow EOT.  Be sure you have correct connection settings selected. From the top menu click on- Connection then Properties and select Ethernet and Use Default Settings. Be sure Monitor Only box is NOT ticked. 
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