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Hello,
I have a subdomain (monitor.mydomain.com) A record pointed to a server in Digital Ocean running Virtualmin. I successfully created a virtualserver, "DNS domain" is not enabled so I keep DNS management externally. Everything works ok except that when I try to install a Letsencrypt certificate, it fails the acme challenge. mydomain.com DNS are managed externally (1&1) I would appreciate your help.
Best, Marcelo
Are you sure your subdomain resolve to correct folder inside your droplet?
I provide FREE Server Management Services in exchange of money
virtualserver name should be monitor.mydomain.com or you have to add a server alias to vhost conf file