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You can drop their IP addresses on firewall. I did that one by one, until all four of them was blocked. Finally there were no other established connection from z-way to server. Although I saw it tries also other address which doesn't reply.

Same here. According to https://support.zwave.eu/status/ Germany server is not available, but my z-way had an active session with its IP 78.46.43.211. I've forced a change to another server, but Alexa still saying that device is not responding.