v4043: Improve support for customers using proxy and AD

Provides a fix that can help customers in larger organisations to connect to the license server.

We have also provided guidelines on how to connect to the license server for clients with a group policy that blocks certain type of requests: https://github.com/Cryptolens/cryptolens-dotnet#issue-with-activation-even-if-apicryptolensio-is-accessible-in-the-browser