Pypi remote returns 404 even if the package exists in public registry

Steps to reproduce:

When running this cURL directly to the public registry:

curl -v https://pypi.python.org/simple/pkg-resources/

It returns: 200 OK

When running through Artifactory Pypi Remote repository:

curl -v http://localhost:8081/artifactory/api/pypi/pypi-remote/simple/pkg-resources/

It returns: 404