Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
I cannot properly visit domains after attempting to add certificates for subdomains. Visiting nextcloud.caviomorpha.dev in Firefox brings:
nextcloud.caviomorpha.dev has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site.
The issue is most likely with the web site, and there is nothing you can do to resolve it. You can notify the web site’s administrator about the problem.
Only my main domain for my static website, caviomorpha.dev, works. I cannot expand it to any subdomains due to this error.
My domain is: nextcloud.caviomorpha.dev
I ran this command: certbot certonly --nginx -d nextcloud.caviomorpha.dev
It produced this output:
My web server is (include version): weiqi.caviomorpha.dev
The operating system my web server runs on is (include version): Debain 11 64-bit
My hosting provider, if applicable, is: Hostinger
I can login to a root shell on my machine (yes or no, or I don't know): yes
I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 1.12.0