I have a VPS server under Ubuntu 17.10, and I have 2 domains, I have created a successful SSL certificate for the first domain 2 months ago, Today I tried to install lets encrypt domain for the 2nd one, with
certbot --authenticator standalone --installer apache -d domain.com -d www.domain.com --pre-hook "systemctl stop apache2" --post-hook "systemctl start apache2"
Now on chrome, I got the invalid certificate with
How can I debug and fix this error? Thanks?