Bitwarden's standard Linux deployment can automatically generate certificates with Let's Encrypt. It requires that your Bitwarden instance is directly accessible from the internet. This post demonstrates how to use the Cloudflare DNS Certbot plugin that will work for installations behind a firewall.

When Windows Firewall is configured to block outbound connections without a matching rule, it can prevent the WSL VM from accessing the network. You may need to add Hyper-V firewall rules to allow the traffic from the VM.