Hi, We faced the same issue lately. After hanging around, we found that the root cause was the default behavior of the proxy_cache, which converts the HEAD method to GET. As docker push relies on some HEAD calls (see https://docs.docker.com/registry/spec/api/#pushing-an-image), it fails. The following post helped us to fixed our configuration: https://serverfault.com/questions/530763/by baptiste - How to...