Run 2 instances of the Docker container rustdesk/rustdesk-server with hhbr and hhbs and it will work locally. It can also work in a single container with the s6 overlay variant.
Maybe because of that stupid screaming warning banner on the website:
WARNING: YOU MAY BE BEING SCAMMED!
If you are on the phone with someone you DON'T know AND TRUST who has asked you to install RustDesk,
do not install and hang up immediately.
They are likely a scammer trying to steal your money or other private information.
That's a pretty good warning, though! People use remote access software like TeamViewer to scam people out of money constantly, there's entire offices where people go to work just to scam people out of their money using this software.
It's such a huge problem that it really does warrant all of this attention.
Nope, it's a huge problem for all of them, it has been a huge problem with TeamViewer for ages. However, putting these large banners up likely helps ensure that it's actually not a huge problem for Rustdesk. It's more likely to be a huge problem for services that don't put up these banners. That's exactly why you put up these banners, you don't really want to be a part of enabling these scams.
That kind of warning exists because a lot of people are being scammed. Warning people not to let strangers have access to their PC seems like the right thing to do.
It can be done much more elegantly. E.g. when you’re trying to actually set up a connection and not on the front page for all of your users coming to the site, especially those with `Referer=news.ycombinator.com`