Package Server could not access own Web Site using HTTPS CEM, although it is configured to serve it. The HTTPS CEM requests from clients cannot be served. See logs for detailed failure reason. (health state: 0x00000330).
In this case, at the NS console location:
Site Management | Internet Sites | Default Internet Site | Site Servers | <SiteServerName> under the custom settings section, both:
Deselecting Publish HTTP codebase, resolved the issue