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untrusted certificate to mozilla.cloudflare-dns.com

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I am consistently getting messages like this from my firewall. "firefox.exe attempted to establish a connection relying on an untrusted certificate to mozilla.cloudflare-dns.com. We blocked the connection to keep your data safe since untrusted certificates are issued by unrecognized Certificate Authorities."

I am consistently getting messages like this from my firewall. "firefox.exe attempted to establish a connection relying on an untrusted certificate to mozilla.cloudflare-dns.com. We blocked the connection to keep your data safe since untrusted certificates are issued by unrecognized Certificate Authorities."

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That is the server used for DNS over HTTPS. There should be no problem with connecting to this server.