I can login to a root shell on my machine (yes or no, or I don’t know): no
I’m using a control panel to manage my site (no, or provide the name and version of the control panel): ispConfig 220.127.116.11
The automatic renewal does not work with my hosting provider. I am not a technician - I can’t fix this anyway. What helps me is to know, if this is a LetsEncrypt problem or an insufficient configuration of the nginx webserver.
Thanks very much to anyone who is willing to share his knowledge with me.
Nginx is just the "user" of the certificate. An ACME client is responsible for the renewal and reloading of nginx. This is probably done by your control panel. If you're having issues, contact your hosting provider.
Ah, that would have been crucial information for us.
Well, than your renewal would be "by hand" too I'm afraid. Because a renewal is just a newly signed certificate, but than for the same hostnames as the previous certificate. So the only way to get that new certificate, is to do everything over again.
Unless your ISPconfig panel has a Let's Encrypt plugin of course, but something tells me you would have used that earlier, if you had the chance
Which feature exactly? Please give us more details. Did you do stuff 100 % by hand? As in, use a webbased client such as sslforfree.com and manually uploaded the cert from your computer to ISPconfig? Or did you "by hand" click a single button in ISPconfig to get and install the certificate with one press of that button?