LetsEncrypt Certificate renewal fails


I have nextcloudpi installed on my raspi (NC version, NCpi version 1.51.2).
Trying to renew my letsencrypt certificate results in following error:

All renewals failed. The following certificates could not be renewed:
/etc/letsencrypt/live/xxxx.spdns.de/fullchain.pem (failure)

1 renew failure(s), 0 parse failure(s)


The entered domain name is correct. What steps do I have to perform to check my configuration?

Thank’s a lot!!

There was a Let’s Encrypt interrupt today morning.

Ok, but that issue is already solved. I still have this problem (same when I tried yesterday)

I was now able to resolve my problem. In nextcloudpi configuration I switched off “Force HTTPS”. Afterwards I was able to renew my cert. I would have expected that turning on “Force HTTPS” would not prevent cert renewal. Any comments on this appriciated!