Ceph monitors are unable to establish quorum, stuck in electing or probing state

Issue

• Ceph monitors are unable to establish quorum, they are staying in peering state, even when they are able to reach other ones via ping

[root@rhscamon2 log]# ceph daemon mon.rhscamon2 mon_status
{
    "name": "rhscamon2",
    "rank": 1,
    "state": "probing",
    "election_epoch": 0,
    "quorum": [],
    "outside_quorum": [
        "rhscamon2"
    ],
    "extra_probe_peers": [],
    "sync_provider": [],
    "monmap": {
        "epoch": 1,
        "fsid": "xxxxx-ceph-cluster-fsid",
        "modified": "0.000000",
        "created": "0.000000",
        "mons": [
            {
                "rank": 0,
                "name": "rhscamon1",
                "addr": "192.168.66.12:6789\/0"
            },
            {
                "rank": 1,
                "name": "rhscamon2",
                "addr": "192.168.66.251:6789\/0"
            },
            {
                "rank": 2,
                "name": "rhscamon3",
                "addr": "192.168.66.149:6789\/0"
            }
        ]
    }
}
[root@rhscamon2 log]# ceph daemon mon.rhscamon2 quorum_status
{
    "election_epoch": 0,
    "quorum": [],
    "quorum_names": [],
    "quorum_leader_name": "",
    "monmap": {
        "epoch": 1,
        "fsid": "xxxxx-ceph-cluster-fsid",
        "modified": "0.000000",
        "created": "0.000000",
        "mons": [
            {
                "rank": 0,
                "name": "rhscamon1",
                "addr": "192.168.66.12:6789\/0"
            },
            {
                "rank": 1,
                "name": "rhscamon2",
                "addr": "192.168.66.251:6789\/0"
            },
            {
                "rank": 2,
                "name": "rhscamon3",
                "addr": "192.168.66.149:6789\/0"
            }
        ]
    }
}