Hi @CommanderLaus ,

Are you sure that your post data is correct? It needs to be in the following format:

{
    "revision": {
	    "clientId": "value",
	    "version": 0,
	    "lastModifier": "value"
	},
    "state": "value",
    "disconnectedNodeAcknowledged": true
}

yours looks like this:

{
	"revision": {
		"version": 18,
		"clientId": "01891026-da00-199f-9dc9-ae3a37dce067"
	},
	"status": {
		"runStatus": "RUNNING"
	},
	"component": {
		"id": "0189100e-1e29-115c-ec96-b857cd155f4a",
		"state": "RUNNING"
	},
	"id": "0189100e-1e29-115c-ec96-b857cd155f4a"
}

refer to : https://nifi.apache.org/docs/nifi-docs/rest-api/index.html

If that helps please accept solution.

Thanks