Multisite sync not working - permission denied

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Hi,

radosgw-admin -v
ceph version 15.2.4 (7447c15c6ff58d7fce91843b705a268a1917325c) octopus (stable)

Multisite sync was something I had working with a previous cluster and an earlier Ceph version, but it doesn't now, and I can't understand why.
If anyone with an idea of a possible cause could give me a clue I would be grateful.
I have clusters set up using Rook, but as far as I can tell, that's not a factor.

On the primary cluster, I have this:

radosgw-admin zonegroup get --rgw-zonegroup zonegroup-a
{
    "id": "b115d74a-2d5f-4127-b621-0223f1e96c71",
    "name": "zonegroup-a",
    "api_name": "zonegroup-a",
    "is_master": "true",
    "endpoints": [
        "http://192.168.30.8:80"
    ],
    "hostnames": [],
    "hostnames_s3website": [],
    "master_zone": "024687e0-1461-4f45-9149-9e571791c2b3",
    "zones": [
        {
            "id": "024687e0-1461-4f45-9149-9e571791c2b3",
            "name": "zone-a",
            "endpoints": [
                "http://192.168.30.8:80"
            ],
            "log_meta": "false",
            "log_data": "true",
            "bucket_index_max_shards": 11,
            "read_only": "false",
            "tier_type": "",
            "sync_from_all": "true",
            "sync_from": [],
            "redirect_zone": ""
        },
        {
            "id": "6ba0ee26-0155-48f9-b057-2803336f0d66",
            "name": "zone-b",
            "endpoints": [
                "http://192.168.30.108:80"
            ],
            "log_meta": "false",
            "log_data": "true",
            "bucket_index_max_shards": 11,
            "read_only": "false",
            "tier_type": "",
            "sync_from_all": "true",
            "sync_from": [],
            "redirect_zone": ""
        }
    ],
    "placement_targets": [
        {
            "name": "default-placement",
            "tags": [],
            "storage_classes": [
                "STANDARD"
            ]
        }
    ],
    "default_placement": "default-placement",
    "realm_id": "8c38fa05-c19d-4e30-bc98-e2bc84eccb68",
    "sync_policy": {
        "groups": []
    }
}

It's identical on the secondary (that's after a realm pull, an update of the zone-b endpoints, and a period commit), which I double-checked by piping the output to md5sum on both sides.
The system user created on the primary is

radosgw-admin user info --uid realm-a-system-user
{
    ...
    "keys": [
        {
            "user": "realm-a-system-user",
            "access_key": "IUs+USI5IjA8WkZPRjU=",
            "secret_key": "PGRDSzRERD4lbF9AYThuLzkvW1QvL148Q147PA=="
        }
    ...
}

The zones on both sides have these keys

radosgw-admin zone get --rgw-zone zone-a
{
    ...
    "system_key": {
        "access_key": "IUs+USI5IjA8WkZPRjU=",
        "secret_key": "PGRDSzRERD4lbF9AYThuLzkvW1QvL148Q147PA=="
    },
    ...
}

radosgw-admin zone get --rgw-zonegroup zonegroup-a --rgw-zone zone-b
{
    ...
    "system_key": {
        "access_key": "IUs+USI5IjA8WkZPRjU=",
        "secret_key": "PGRDSzRERD4lbF9AYThuLzkvW1QvL148Q147PA=="
    },
    ...
}


Yet, on the secondary

radosgw-admin sync status
          realm 8c38fa05-c19d-4e30-bc98-e2bc84eccb68 (realm-a)
      zonegroup b115d74a-2d5f-4127-b621-0223f1e96c71 (zonegroup-a)
           zone 6ba0ee26-0155-48f9-b057-2803336f0d66 (zone-b)
  metadata sync preparing for full sync
                full sync: 64/64 shards
                full sync: 0 entries to sync
                incremental sync: 0/64 shards
                metadata is behind on 64 shards
                behind shards: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63]
      data sync source: 024687e0-1461-4f45-9149-9e571791c2b3 (zone-a)
                        syncing
                        full sync: 0/128 shards
                        incremental sync: 128/128 shards
                        data is caught up with source

and on the primary

radosgw-admin sync status
          realm 8c38fa05-c19d-4e30-bc98-e2bc84eccb68 (realm-a)
      zonegroup b115d74a-2d5f-4127-b621-0223f1e96c71 (zonegroup-a)
           zone 024687e0-1461-4f45-9149-9e571791c2b3 (zone-a)
  metadata sync no sync (zone is master)
2020-11-06T10:58:46.345+0000 7fa805c201c0  0 data sync zone:6ba0ee26 ERROR: failed to fetch datalog info
      data sync source: 6ba0ee26-0155-48f9-b057-2803336f0d66 (zone-b)
                        failed to retrieve sync info: (13) Permission denied

Given that all the keys above match, that "permission denied" is a mystery to me, but it does accord with:

export AWS_ACCESS_KEY_ID="IUs+USI5IjA8WkZPRjU="
export AWS_SECRET_ACCESS_KEY="PGRDSzRERD4lbF9AYThuLzkvW1QvL148Q147PA=="
s3cmd ls --no-ssl --host-bucket= --host=192.168.30.8     # OK, but:
s3cmd ls --no-ssl --host-bucket= --host=192.168.30.108
# ERROR: S3 error: 403 (InvalidAccessKeyId)
# Although
curl -L http://192.168.30.108  # works: <?xml version="1.0" encoding="UTF-8 ...

192.168.30.108 is the external IP, but just to be certain I was hitting zone-b, I tried this also within the cluster using its internal IP

s3cmd ls --no-ssl --host-bucket= --host=10.41.157.115
# ERROR: S3 error: 403 (InvalidAccessKeyId)

This seems to be the reason it's not syncing, but why?
The user with those keys existed on the primary before the realm pull, in agreement with every procedure I have seen for setting up multisite.

Any suggestions?
Regards,
Michael


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