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I have Adguard on OPNSense and also had this issue.
To fix this, I set the DNS to a public resolver (Cloudflare) on System-->Settings-->General as suggested. However, that doesn't actually work unless you also check the box on the same page "Do not use the local DNS service as a nameserver for this system".
To fix this, I set the DNS to a public resolver (Cloudflare) on System-->Settings-->General as suggested. However, that doesn't actually work unless you also check the box on the same page "Do not use the local DNS service as a nameserver for this system".
