@olivierlambert I built it from sources.. I'm reluctant to touch it because its working and I count on it. I'll upgrade it today.

@Darkbeldin That solved the problem! I assumed that the expected behavior for 'Prevent accidental shutdown' would be a "Are you sure you want to shutdown this VM?" dialog box. Not an error notification.

I installed HAOS by importing an ova file into XO.

XO says 'Management Agent Detected' but there is no OS logo icon next to the VM in the list of VMs in XO (Presence of the logo is an indicator that the guest tools are installed, recognized, and working).

When I press the stop button, I get an 'Operation Blocked' Opaque Ref popup error notification as if the guest tools aren't working.

I want to be able to gracefully shut the VM down with NUT.

My version of XO is a year old.

vm.stop
{
  "id": "2c5897a7-2fe4-43dd-ecbc-207e258664a2",
  "force": false
}
{
  "code": "OPERATION_BLOCKED",
  "params": [
    "OpaqueRef:2f53e52d-0ffe-4841-ab9d-9b56bcb75777",
    "true"
  ],
  "task": {
    "uuid": "8311b925-779b-de5a-5450-06b3c375a38b",
    "name_label": "Async.VM.clean_shutdown",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20230105T18:42:00Z",
    "finished": "20230105T18:42:00Z",
    "status": "failure",
    "resident_on": "OpaqueRef:298b8e45-77cc-4d31-89df-6c46a23e5993",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "OPERATION_BLOCKED",
      "OpaqueRef:2f53e52d-0ffe-4841-ab9d-9b56bcb75777",
      "true"
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename ocaml/xapi/xapi_vm_lifecycle.ml)(line 697))((process xapi)(filename ocaml/xapi/xapi_vm_helpers.ml)(line 1432))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/xapi/rbac.ml)(line 231))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 103)))"
  },
  "message": "OPERATION_BLOCKED(OpaqueRef:2f53e52d-0ffe-4841-ab9d-9b56bcb75777, true)",
  "name": "XapiError",
  "stack": "XapiError: OPERATION_BLOCKED(OpaqueRef:2f53e52d-0ffe-4841-ab9d-9b56bcb75777, true)
    at Function.wrap (/opt/xo/xo-builds/xen-orchestra-202112300215/packages/xen-api/src/_XapiError.js:16:12)
    at _default (/opt/xo/xo-builds/xen-orchestra-202112300215/packages/xen-api/src/_getTaskResult.js:11:29)
    at Xapi._addRecordToCache (/opt/xo/xo-builds/xen-orchestra-202112300215/packages/xen-api/src/index.js:898:24)
    at forEach (/opt/xo/xo-builds/xen-orchestra-202112300215/packages/xen-api/src/index.js:932:14)
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (/opt/xo/xo-builds/xen-orchestra-202112300215/packages/xen-api/src/index.js:922:12)
    at Xapi._watchEvents (/opt/xo/xo-builds/xen-orchestra-202112300215/packages/xen-api/src/index.js:1087:14)"
}