Load balancer ICMP health monitor fails to perform checks

Issue

• One loadbalancer to perform icmp checks for a service with 3 members. We've checked the traffic with tcpdump in the amphora tap interface and we can see https request but not icmp, so the health monitor sets the pool members in error state.

• This is the LB status:

(overcloud) [stack@undercloud [I-P-Director] ~]$ openstack loadbalancer status show 4fc23f8f-948d-4109-b027-427135941680
{
    "loadbalancer": {
        "id": "4fc23f8f-948d-4109-b027-427135941680",
        "name": "kaas-lb-e3212482-926a-43f3-8cca-6e831703aeca",
        "operating_status": "ERROR",
        "provisioning_status": "ACTIVE",
        "listeners": [
            {
                "id": "aada2a72-5c8c-4695-991e-908377cbf09d",
                "name": "kaas-lstnr-e3212482-926a-43f3-8cca-6e831703aeca",
                "operating_status": "ONLINE",
                "provisioning_status": "ACTIVE",
                "pools": [
                    {
                        "id": "8ca1a61d-8c02-42af-b7cb-37ddcae3600a",
                        "name": "kaas-pool-e3212482-926a-43f3-8cca-6e831703aeca",
                        "provisioning_status": "ACTIVE",
                        "operating_status": "DEGRADED",
                        "health_monitor": {
                            "id": "4c63fe2f-fc86-4051-9352-065fa94148af",
                            "name": "kaas-monitor-e3212482-926a-43f3-8cca-6e831703aeca",
                            "type": "HTTPS",
                            "provisioning_status": "ACTIVE",
                            "operating_status": "ONLINE"
                        },
                        "members": [
                            {
                                "id": "af6ec98f-248e-4a73-9aca-7d52be0710f1",
                                "name": "kaas-member-b1ca3202-b420-409d-9dfb-94f8586ce1a4",
                                "operating_status": "ERROR",
                                "provisioning_status": "ACTIVE",
                                "address": "192.168.1.182",
                                "protocol_port": 443
                            },
                            {
                                "id": "37e6f992-2add-4769-9252-943232829587",
                                "name": "kaas-member-7ef3b9a8-f2ce-4c25-b1b5-8e305671833f",
                                "operating_status": "ONLINE",
                                "provisioning_status": "ACTIVE",
                                "operating_status": "ONLINE",                                                                                                                                                                        [0/1822]
                                "provisioning_status": "ACTIVE",
                                "address": "192.168.1.197",
                                "protocol_port": 443
                            },
                            {
                                "id": "becf03c3-92cb-4547-90e2-b2035a584747",
                                "name": "kaas-member-6e386cde-3318-424b-be9e-5ef883e0ec3c",
                                "operating_status": "ERROR",
                                "provisioning_status": "ACTIVE",
                                "address": "192.168.1.7",
                                "protocol_port": 443
                            }
                        ]
                    }
                ]
            },
            {
                "id": "b8686e53-abca-42cc-a5bf-7f1bd86f9171",
                "name": "kaas-lstnr-e3212482-926a-43f3-8cca-6e831703aeca-ucp",
                "operating_status": "ONLINE",
                "provisioning_status": "ACTIVE",
                "pools": [
                    {
                        "id": "50d9694b-f4c9-48cc-b76f-30270cc73324",
                        "name": "kaas-pool-e3212482-926a-43f3-8cca-6e831703aeca-ucp",
                        "provisioning_status": "ACTIVE",
                        "operating_status": "ERROR",
                        "health_monitor": {
                            "id": "185651bc-d172-4096-ad31-1ff4e4f3ccfe",
                            "name": "kaas-monitor-e3212482-926a-43f3-8cca-6e831703aeca-ucp",
                            "type": "PING",
                            "provisioning_status": "ACTIVE",
                            "operating_status": "ONLINE"
                        },
                        "members": [
                            {
                                "id": "e864dafb-9a21-4ea1-bdaa-ed41174cab2b",
                                "name": "kaas-member-b1ca3202-b420-409d-9dfb-94f8586ce1a4",
                                "operating_status": "ERROR",
                                "provisioning_status": "ACTIVE",
                                "address": "192.168.1.182",
                                "protocol_port": 6443
                            },
                            {
                                "id": "4e12ddd1-dcd7-4967-9123-c833b201e5d0",
                                "name": "kaas-member-7ef3b9a8-f2ce-4c25-b1b5-8e305671833f",
                                "operating_status": "ERROR",
                                "provisioning_status": "ACTIVE",
                                "address": "192.168.1.197",
                                "protocol_port": 6443
                            },
                            {
                                "id": "7f23f869-e1ab-4f4a-8570-55cd38fe2f32",
                                "name": "kaas-member-6e386cde-3318-424b-be9e-5ef883e0ec3c",
                                "operating_status": "ERROR",
                                "provisioning_status": "ACTIVE",
                                "address": "192.168.1.7",
                                "protocol_port": 6443
                            }
                        ]
                    }
                ]
            }
        ]
    }
}