Depends on the client. Firefox doesn't support a fallback and tries unencrypted or fails depending on how you configured it. AdGuard Home can use fallbacks so y

Depends on the client. Firefox doesn't support a fallback and tries unencrypted or fails depending on how you configured it. AdGuard Home can use fallbacks so you can run a local instance and point Firefox there. Some providers supply fallbacks (https://1.1.1.1/dns-query https://1.1.1.1/dns-query and https://1.0.0.1/dns-query https://1.0.0.1/dns-query for example).