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by adrian_b 8 hours ago
The great mistake is that those servers have a management Ethernet interface connected to the Internet.

The management Ethernet port of a server, on which it listens for the IPMI protocol, is supposed to be connected only to a dedicated internal management network, which must be separated from the Internet, and also from the normal internal networks.

It is not expected that IPMI is secure. Security is supposed to be achieved by physical separation.