rjo Hi! Not yet, I got carried by another project and did not reply.
Regarding the software we have a PC running on x64 Windows 10. I followed the setup manual from here: https://quartiq.de/stabilizer/setup.html. I have Mosquitto version 2.0.14 from here: https://mosquitto.org/download/, rustup version 1.57, cargo-binutils installed. I have just noticed that the network Sinara is connected to does not have a properly configured DHCP server, but this should not affect USB connection? I also do not know if the software that I have mentioned here is relevant to whether or not dfu-util recognizes the device. The version of dfu-util is 0.11.
Regarding the hardware, Sinara is connected to a Netgear GS110TPv3 switch, which is connected to the lab PC with an Ethernet to USB adapter and is set to have a fixed IP address 10.34.16.99, and the IP address of Sinara is 10.34.16.100. Stabilizer is now powered from the main power supply that is plugged into Kasli. The ethernet port is disconnected since I only have PoE ports available on the switch, should be able to turn off though. In any case, the problem persisted with Stabilizer both connected and disconnected to the switch.
Please let me know if there is any specific information you need so that I can be more useful in answering. Also, I see that I did not configure DHCP server and Mosquitto properly, but I do not know if this can lead to the fact that dfu-util does not see the device. Thank you.