The documentation is a bit unclear on both JFrogs webpage as well as in Inedos webdocs.
https://www.jfrog.com/confluence/display/JFROG/NuGet+Repositories
https://docs.inedo.com/docs/proget/feeds/nuget
Because of the way Artifactory setups their remote nuget feeds, it's easy to misunderstand.
I've tried using the following the url field:
http://<url path to server>:<port>/nuget/<repo name>/
with
Packages
in the NuGet Download Context Path field. The field has to contain something. But that's not correct. Nor is moving the repo name to the Download Context Path field.