I am currently running DietPI 9.5 - Debian on a Raspberry Pi 4. I have configured a reverse proxy or Cloudflare tunnel and successfully installed Mailcow following the provided documentation. While the tunnels appear to be set up correctly, I am encountering an issue where, upon attempting to log in (which sporadically works due to the website consistently displaying a 502 Bad Gateway error), I am immediately redirected back to the 502 error page. I have meticulously reviewed the logs but have not identified any significant issues. So what can I do to fix this problem?

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In short yes, do not use Cloudflare :-D. Or make it work. :-D Today I was solving similar issue, when you proxy something (not CF,…) I put in the end of tunnel extra firewall. That sometime break this tunnel, because state of the firewall. I resolved it by increasing keep alive parameter on targeted server and enforcing proxy to keep alive whit lower TTL than targeted server, so tunnel is periodically “ping” from proxy even when no one is using it. If this is your case, I do not know, if you are able to tweak CF, I do not know, sorry,… Writing just bc of similarity of our problems 👍️

PS: Im talking only about https trafic, CF in lower tiers does not support proxy for smtp traffic,..

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