Dokku maintainer here. Happy to help you debug why this is happening on our discord/slack. Links here: https://dokku.com/docs/getting-started/where-to-get-help/
- nginx on the host (default)
- traefik (via docker labels)
- caddy (via docker labels)
- haproxy (via docker labels)
We'll also soon support nginx via docker labels, which will work around issues where Docker sometimes assigns random IP addresses (and unlock TCP/UDP proxying as well).