Error message: {"NeutronError": {"message": "The resource could not be found.", "type": "HTTPNotFound", "detail": ""}}

Issue

• 2 VNFs were unreachable. We tried to re-deploy both VNFs, and the following error appeared into nova-compute.logs:

2019-11-21 01:45:43.565 26836 DEBUG nova.network.neutronv2.api [req-74d1cd38-c8a8-4211-bb27-8943d4e4c6ba - - - - -] [instance: 967c1d37-2db2-4722-9690-042e4fc58084] _get_instance_nw_info() _get_instance_nw_info /usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py:1452
2019-11-21 01:45:43.684 26836 DEBUG neutronclient.v2_0.client [req-74d1cd38-c8a8-4211-bb27-8943d4e4c6ba - - - - -] Error message: {"NeutronError": {"message": "The resource could not be found.", "type": "HTTPNotFound", "detail": ""}} _handle_fault_response /usr/lib/python2.7/site-packages/neutronclient/v2_0/client.py:259
2019-11-21 01:45:43.746 26836 DEBUG nova.network.base_api [req-74d1cd38-c8a8-4211-bb27-8943d4e4c6ba - - - - -] [instance: 967c1d37-2db2-4722-9690-042e4fc58084] Updating instance_info_cache with network_info: [{"profile": {}, "ovs_interfaceid": null, "preserve_on_delete": true, "network": {"bridge": null, "subnets": [{"ips": [{"meta": {}, "version": 4, "type": "fixed", "floating_ips": [], "address": "10.10.10.10"}], "version": 4, "meta": {"dhcp_server": "10.10.10.101"}, "dns": [{"meta": {}, "version": 4, "type": "dns", "address": "10.10.10.11"}], "routes": [{"interface": null, "cidr": "169.254.169.254/32", "meta": {}, "gateway": {"meta": {}, "version": 4, "type": "gateway", "address": "10.10.10.1"}}], "cidr": "10.0.0.0/8", "gateway": {"meta": {}, "version": 4, "type": "gateway", "address": "10.10.10.1"}}], "meta": {"injected": false, "tenant_id": "f43facac4c874a8bb9fe0aeca8685ca8", "mtu": 1500}, "id": "2ec336b8-6837-42a8-b68a-21f0cb813ade", "label": "ctlplane"}, "devname": "tap7de3f07d-ba", "vnic_type": "baremetal", "qbh_params": null, "meta": {}, "details": {}, "address": "aa:aa:aa:aa:aa:aa", "active": true, "type": "other", "id": "7de3f07d-ba02-408e-9904-669c96a5b8a3", "qbg_params": null}] update_instance_cache_with_nw_info /usr/lib/python2.7/site-packages/nova/network/base_api.py:48
2019-11-21 01:45:43.755 26836 DEBUG oslo_concurrency.lockutils [req-74d1cd38-c8a8-4211-bb27-8943d4e4c6ba - - - - -] Releasing semaphore "refresh_cache-967c1d37-2db2-4722-9690-042e4fc58084" lock /usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:228
2019-11-21 01:45:43.755 26836 DEBUG nova.compute.manager [req-74d1cd38-c8a8-4211-bb27-8943d4e4c6ba - - - - -] [instance: 967c1d37-2db2-4722-9690-042e4fc58084] Updated the network info_cache for instance _heal_instance_info_cache /usr/lib/python2.7/site-packages/nova/compute/manager.py:6779

• Currently, both VNFs are in ERROR status under Overcloud:

(undercloud) [stack@undercloud ~]$ nova list | grep ERROR
| e204763a-1a36-4030-9b11-5483eb5d9a84 | vm_hostname_01   | ERROR  | -          | NOSTATE     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 64b534e7-dc70-4786-b4fa-e5ce68368e26 | vm_hostname_02    | ERROR  | -          | NOSTATE     |