On Artifactory 6.16.2 I'm trying to cache a remote Nexus Helm repository. When I enter the URL of the repository I'm getting an error in UI and logs:

Error occurred while performing folder replication for 'helm:' to 'https://repo.myhost.com/repository/helm': Unable to identify target URL as an Artifactory instance: HTTP/1.1 404 Not Found

java.lang.IllegalArgumentException: Unable to identify target URL as an Artifactory instance: HTTP/1.1 404 Not Found

I also tried with https://repo.myhost.com/service/rest/repository/browse/helm/. This does not give an error in the UI but it does in the logs. Also Unable to identify target URL as an Artifactory.

I enabled the option to bypass HEAD requests, no difference.

Are remote Nexus Helm repositories supported?

--EDIT--

Adding some screenshots of our configuration