@gertjan Only thing in the error.log under /var/log/nginx is from 2020,
2020/07/31 12:48:14 [crit] 4493#100471: *102827 SSL_write() failed (13: Permission denied) while processing HTTP/2 connection, client: 192.168.1.9, server: 0.0.0.0:4430
2020/08/26 15:32:03 [crit] 8968#100454: *25803 SSL_write() failed (13: Permission denied) while processing HTTP/2 connection, client: 192.168.1.9, server: 0.0.0.0:10443
2020/09/08 04:19:59 [error] 4127#100429: *20842 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 192.168.1.9, server: , request: "POST /acme/acme_certificates.php HTTP/2.0", upstream: "fastcgi://unix:/var/run/php-fpm.socket", host: "violetdragon.ddns.net:10443", referrer: "https://violetdragon.ddns.net:10443/acme/acme_certificates.php"