Let's encrypt additional domain

What is the additional domain good for, which can be configured in the Let’s encrypt menu?

If I wanted nextcloud to be available just via a subdomain and block requests via main domain completely, how could I do this?
There should be no message from nextcloud regarding access from untrusted domain, just a blank page or an error message.


Hmm, I don’t quite understand why you would do that. I mean, if you don’t want to use the main domain, then just don’t use it, i.e. don’t create a DNS record for it in the first place → problem solved.

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You could point the main domain apache config to somewhere else

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