Downloading http://security.debian.org/dists/stretch/updates/InRelease...
gpgv:  RSA key ID C857C906
gpgv: Good signature from "Debian Security Archive Automatic Signing Key (8/jessie) <ftpmaster@debian.org>"

Mirror [mirror24]: http://security.debian.org/ stretch/updates successfully added.
You can run 'aptly mirror update mirror24' to download repository contents.
