Individual S3 queries which are answered as 403 or 404 can be checked in the bycast-err.log in /var/local/log on the primary admin node Oct 6 07:32:01 AMS-ADM1 NMS: |2020-10-06T07:32:01.829| ERROR /us...Individual S3 queries which are answered as 403 or 404 can be checked in the bycast-err.log in /var/local/log on the primary admin node Oct 6 07:32:01 AMS-ADM1 NMS: |2020-10-06T07:32:01.829| ERROR /usr/local/lib/site_ruby/mgmt-api/objects/metadata.rb:108:in `rescue in find' In 11.5 and later, S3 responses (HTTP XXX) can be viewed and graphed in Prometheus metrics page (https://ADMIN_NODE/metrics/graph) under storagegrid_s3_requests_total.