My Vitodens 222-F does not connect to the backend. Device UI shows Connection status: connected Backend connection: disabled. I connected the gas heater to a separate network and ran packet capture, that shows a TLS Alert: Level: Fatal, Description: Unknown CA. The backend’s leaf cert was issued 2025-05-09, and as a new owner I don't know, when the heater was last connected. I assume my device has missed an update and is lacking the latest CA cert. I have tried all regular recommendations: Rebooted several times with long pauses Used mobile hotspot Waited for 90+ minutes with network connected Happy to provide the pcap file as well upon request. Please advise how to proceed?
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