Hello Experts: I'm new to the openstack and trying to deploy one baremental node but it failed on "wait call-back" stage. I checked IPA log on deploy image and it reports the following error [1]. I aslo manually run the command [2] it gave me the same error "404". I used the devstack to depoly openstack (stable/ussuri). What's the possible problem? Any suggestion is appreciated. -Jack [1]: DEBUG ironic_python_agent.ironic_api_client [-] Looking up node with addresses 'e4:43:4b:93:4c:12,e4:43:4b:93:4c:10,0c:42:a1:56:b8:c5,e4:43:4b:93:4c:13,e4:43:4b:93:4c:11,0c:42:a1:56:b8:c4' and UUID None at http://10.75.205.241/baremetal _do_lookup /usr/lib/python3.6/site-packages/ironic_python_agent/ironic_api_client.py:163[00m ERROR ironic_python_agent.ironic_api_client [-] An error occurred while attempting to discover the available Ironic API versions, falling back to using version 1.31: json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) ERROR ironic_python_agent.ironic_api_client Traceback (most recent call last): ERROR ironic_python_agent.ironic_api_client File "/usr/lib/python3.6/site-packages/ironic_python_agent/ironic_api_client.py", line 97, in _get_ironic_api_version ERROR ironic_python_agent.ironic_api_client data = jsonutils.loads(response.content) ERROR ironic_python_agent.ironic_api_client File "/usr/lib/python3.6/site-packages/oslo_serialization/jsonutils.py", line 248, in loads ERROR ironic_python_agent.ironic_api_client return json.loads(encodeutils.safe_decode(s, encoding), **kwargs) ERROR ironic_python_agent.ironic_api_client File "/usr/lib64/python3.6/json/__init__.py", line 354, in loads ERROR ironic_python_agent.ironic_api_client return _default_decoder.decode(s) ERROR ironic_python_agent.ironic_api_client File "/usr/lib64/python3.6/json/decoder.py", line 339, in decode ERROR ironic_python_agent.ironic_api_client obj, end = self.raw_decode(s, idx=_w(s, 0).end()) ERROR ironic_python_agent.ironic_api_client File "/usr/lib64/python3.6/json/decoder.py", line 357, in raw_decode ERROR ironic_python_agent.ironic_api_client raise JSONDecodeError("Expecting value", s, err.value) from None ERROR ironic_python_agent.ironic_api_client json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) ERROR ironic_python_agent.ironic_api_client [00m WARNING ironic_python_agent.ironic_api_client [-] Failed looking up node with addresses 'e4:43:4b:93:4c:12,e4:43:4b:93:4c:10,0c:42:a1:56:b8:c5,e4:43:4b:93:4c:13,e4:43:4b:93:4c:11,0c:42:a1:56:b8:c4' at http://10.75.205.241/baremetal, status code: 404[00m]]] [2]: curl http://10.75.205.241/baremetal [...snip...] <title>404 Not Found</title>