Logging in to SOGo does not preserve domain when behind a reverse proxy

[deleted]

I’m running Mailcow behind nginx as per the documentation, with the only difference being that I proxy_pass not to 127.0.0.1, but to the server’s local IP address (10.0.0.3).

Upon logging in to mail.example.com/SOGo/, the page redirects to https://sogo/so/test@example.com/Mail, which obviously can’t be resolved.

Visiting https://mail.example.com/so/test@example.com/Mail right after pressing the login button does successfully open SOGo.

I’m wondering if anyone else is having this issue. It looks like an internal redirect is being done by Mailcow at a point where the web server is unaware of the correct domain.

Thanks in advance,
SpagNod

esackbauer

What is the reason that you differ from the documentation? Which ports are you using?

[deleted]

Same ports as the docs, but I’m running nginx in docker as well, so I can’t just tell it to proxy 127.0.0.1, as that would refer to the nginx container itself rather than Mailcow.

esackbauer

https://docs.mailcow.email/post_installation/reverse-proxy/r_p/
It says: “This will also change the bindings inside the Nginx container! This is important, if you decide to use a proxy within Docker.”

So I guess that even if you run nginx in a container you have to bind it to localhost.
I can’t confirm this as I have a reverse proxy on a different machine.

[deleted]

Just checked my mailcow.conf, and I wanted to clear up that I was binding to 0.0.0.0:8080 rather than 127.0.0.1:8080 (as in the docs).

I’ve edited the nginx config to proxy to 127.0.0.1:8080 but I’m currently getting a 502 Bad Gateway error. I take it that this is because nginx and Mailcow aren’t on the same Docker network, which is why I was initially proxying through the local IP.

I’ve been running this setup for a few years, and the issue with SOGo only cropped up a few months ago. I decided to investigate it some more today because I moved my Mailcow to a newer system (using the backup and restore feature so the new setup should be relatively fresh).