I discovered that my MiKTeX installation (on a Windows 10 computer) is unable to connect to the package and/or update servers after installation. What's more, when I attempt to update or add a package, the list of "Remote Package Repositories" shown to me is empty.
Downloading the packages I want into a local repository and installing them from there is also impossible, since running miktexsetup also results in a "Couldn't connect to server" error.
My first suspicion was that this was some kind of issue with my Firewall. However, after I had added exceptions for "miktex-console.exe" to the Firewall I still had the same problem.
What could be the cause of this?