ceheck out this article on cqblueprints describing on how to proxy the adobe repository
in a nutshell, listing for the root is disabled, however, you can use
and see the subfolder listings
The cqblueprints page was very helpful, thank you. The key point is to configure
Auto blocking active = false
in your Nexus Maven repo for the Adobe proxy.
Sub-directories to http://repo.adobe.com/nexus/content/groups/, while browsable, are not useful to a Nexus repo and thus of little use to a development environment.