Hi all! I have the following situation:
- Small VServer at netcup.com, which is also accessible via a subdomain like https://v1234567890.goodsrv.de.
- There is a Rocket.Chat installation running, based on nginx. Website via port 80 is accessible, runs wonderfully
- A free SSL certificate for this subdomain I created at ZeroSSL, runs.
- Certificate needs to be renewed regularly, the first two ways for this (via mail to this server or via DNS entry) are not available to me.
- Third and last way is to put a text file on the server, this must be retrievable under a given path (e.g. http://v1234567890.goodsrv.de/.well-known/pki-validation/abc.txt).

My problem now:
I simply do not succeed in making this file callable. File permissions should not be the problem, I also know the absolute path I am looking for (verified by renaming a graphic file on the website). So in principle it is clear where this file has to go. Only Rocket.Chat produces a 404 error. It also doesn't help if I stop the nginx or rocket.chat service for this. I don't know how I managed to do this the first time, but somehow I must have a thinking error here. Server is running Debian. Does anyone have a tip for me?