Proget npm feed using HTTP/80 when configured to use HTTPS

Hi!

I have an npm-feed i ProGet configured with the connector URL: https://registry.npmjs.org. However, when I try to download packages using this ProGet npm feed, Proget seemingly tries to communicate to registry.npmjs.org on port 80. I only have port 443 open in my outgoing firewall, so this connection attempt fails (and I would like to keep port 80 closed):

System.Net.WebException: Unable to connect to the remote server ---> 
  System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, 
  or established connection failed because connected host has failed to respond 151.101.84.162:80
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, 
  Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)

A get request to download a package from an address like this:

http://<internal proget server>/npm/npm-external/css-selector-tokenizer/-/css-selector-tokenizer-0.7.0.tgz

I get this back from the server (and an entry of the error above in the ProGet logs) :

{"error":"WebException","reason":"Unable to connect to the remote server"}

This does not fail for all packages, but random packages seems to fail each time I clear the ProGet package cache and try to reinstall packages.

Product: ProGet
Version: 4.8.2

atripp

You will need to open both ports; the npm api uses both HTTP and HTTPS.