Only a specific website(s) doesn't open
Most likely this is happening because you're trying to reach a website from the blocklist because you're using Default or Family configuration. Consider switching to Non-filtering configuration if you don't want AdGuard DNS to block any domains, even potentially dangerous ones.
If you believe that AdGuard DNS is incorrectly blocking a domain, please report it to the support team by sending a message to support@adguard-dns.io, our support engineers will reply to you as soon as possible.