This morning we found that the servers certificate expired overnight. Until now it had been automatically renewed every three months without a problem. We set it up using https://www.howtoforge.com/tutorial/securing-ispconfig-3-with-a-free-lets-encrypt-ssl-certificate/ Upon investigation, the renewing script at Code: /etc/init.d/le_ispc_pem.sh appears to have run properly, but the certificate files in Code: /etc/letsencrypt/archive/hostname -f/ are out dated. I'm not sure why they should suddenly stop being updated by LetsEncrypt, but any pointers on how to get fix this would be highly appreciated! Many thanks.