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One of the many tools that admins frequently turned to was netstat. However, the netstat command has been deprecated in favor of the faster, more human-readable ss command. The ss command is a tool ...
I think I have found the solution, it has nothing to do with running multiple versions of solr, I was having the identical issue on a fresh Debian install.
so the solution is:
open the configuration ...
The suggestion of @tero-kilkanen bring me to the idea to use the default-catch all VHost on port 80 for verifications, and give its webroot to the certbot command for any domain:
certbot certonly --...