@Kevin_Z Yes, with the beta firmware the autonegotiation works correctly so that the BE559 is usable for me. Thanks for solving this problem.

@Kevin_Z Ok, I have sent the router configuration.

@Kevin_Z Are you saying you want to limit the WAN negotiation speed to 1000Mbps or 100Mbps but it always negotiates at 2.5Gbps with the Qnap QSW-2104 and Netgear MS305E? Yes Is there a reason why you...

There is a problem with the autonegotiation on the WAN port. The manual setting in the web interface to 1000Mbit or even 100Mbit is ignored after a restart. The router always connects with the max....