We are usingARTIQ v7.8161.8a2ea57, and turned off our hardware device until two days. After then, we tried to reconnect our hardware with computer using LAN. We already confirmed our IP address before, so we implemented command "artiq_flash start" to reboot our device.
And then, our LAN lamp turned on, and also tried to check our ping. But they don't respond. (Destination Host Unreachable)

When we start the flash on board, the temperature is over than 70C (83-85C). I think this temperature is too high to activate our hardware. But we also put another external pan, but it still doesn't work.

What else can we try? For now, we're taking out the boards one by one to let them cool down, but we're still not getting a response to the ping. What other issues could be the cause?

We are using v7.8161.8a2ea57

Are you? The dashboard screenshot says it's ARTIQ-8. Do you have a board/host version mismatch?

    architeuthis I found out our artiq version using command 'artiq_flash --version'. I already know that our software and hardware version isn't match, because I saw that warning on my dashboard, before. But I think this is not our main problem about connection error of Moninj. (We were using ARTIQ well at this condition).

    And there is something weird thing, our error lamp isn't shine.

      I don't personally know what might be wrong with the hardware, although trying to reflash it (preferably with updated binaries) may be a good idea regardless, and would more or less rule out gateware-level issues. See also networking troubleshooting.

      However, for the record, the Moninj error isn't significant: MonInj simply expects to be able to contact the core device, so the error is either an indication that aqctl_moninj_proxy isn't running or just a symptom of the network problems.