I Install ISPConfig Version: 3.1.11 in Ubuntu Server 16.04 and the Apache Version was Apache/2.4.18 (Ubuntu). I create a web domain and subdomain in the web panel. Then I configure the SSL in the web panel but when I look at the ssl directory "/var/www/clients/client1/web1/ssl" only the files mydomain.com.crt, mydomain.com.csr and mydomain.com.key were created and I think mydomain.com.bundle is missing. The Result of the configuration: 1.) mydomain.com indicate a valid certificate. 2.) subdomain.mydomain.com indicate an invalid certificate ( but the Certificate Information, Issued by was reflected ). Note: mydomain.com.key and mydomain.com.csr are configure in my previous ubuntu server using the command openssl req -new -newkey rsa:2048 -nodes -keyout yourdomain.key -out yourdomain.csr Please help me with my configuration problem.