Problem
When the hetzner firewall is used the packets from LetsEncrypt are blocked because the firewall is stateless.
https://community.hetzner.com/tutorials/letsencrypt-dns
Suggested Fix
You could include an information for the users of the hetzner firewall, that they have to configure the corresponding rules (ingoing allow ephemeral Port Range)
Problem
When the hetzner firewall is used the packets from LetsEncrypt are blocked because the firewall is stateless.
https://community.hetzner.com/tutorials/letsencrypt-dns
Suggested Fix
You could include an information for the users of the hetzner firewall, that they have to configure the corresponding rules (ingoing allow ephemeral Port Range)