Comment 7 for bug 1815576

With more debug:

Uploading layer: sha256:4c13f4fa9e39ad08a9478b7e4890e95ec8006e051f0f592e2f619964317187e3
Fetching layer: sha256:4c13f4fa9e39ad08a9478b7e4890e95ec8006e051f0f592e2f619964317187e3
Resetting dropped connection: mirror.bhs1.ovh.openstack.org

then later:

Uploading manifest of type application/vnd.docker.distribution.manifest.v2+json to: http://192.168.24.1:8787/v2/tripleomaster/centos-binary-glance-api/manifests/current-tripleo
http://192.168.24.1:8787 "PUT /v2/tripleomaster/centos-binary-glance-api/manifests/current-tripleo HTTP/1.1" 400 166
{"errors":[{"code":"MANIFEST_BLOB_UNKNOWN","message":"blob unknown to registry","detail":"sha256:4c13f4fa9e39ad08a9478b7e4890e95ec8006e051f0f592e2f619964317187e3"}]}

So it's really a network issue with infra, but our code should try again to fetch and make sure the layer is really uploaded.