A workaround for experiencing suddent network connectivity loss when using old onboard Intel NICs with the e1000e driver.
Learn how to use Hetzner's rescue system to install Debian 13 (Trixie).
Configure a KVM private NAT with a guest acting as a gateway to the outside world. Internal guests will be accessible from the outside world via a reverse proxy and port-forwarding rules.
A post on how to set up KVM on a Hetzner dedicated server, resolving issues with setting up the networking.