I asked ISPconfig to generate a Let's encrypt certificate by clicking on "Let's Encrypt SSL". The certs get created and when I visit the website it has ssl enabled with Let's encrypt. Problems: I receive 4 warning emails from ISPconfig regarding this website: one of which says "06.12.2017-18:39 - WARNING - Let's Encrypt SSL Cert for: xxx.co.uk could not be issued."; 2 warning emails say: "06.12.2017-18:39 - WARNING - Could not verify domain xxx.co.uk, so excluding it from letsencrypt request." and one of the emails has an empty warning message: "06.12.2017-18:39 - WARNING -" the Let's Encrypt SSL box remains unchecked for the website in ISPconfig (new websites without certs or old ones with certs) This server was upgraded from Jessie to Stretch and ISPconfig has been upgraded to 3.1.8p1. At the time, ISPconfig needed "./certbot-auto" (https://www.howtoforge.com/tutorial...ovecot-ispconfig-3-1/2/#-install-lets-encrypt). I have deleted the directory /opt/certbot and installed certbot using "apt-get install certbot" and updated ISPconfig again but I still get this issue. In the ISPconfig SSL settings, I have tried to disable "Skip Lets Encrypt Check" but this doesn't make a difference. Any ideas guys?