При использовании DNS over HTTPS сервера от Cloudflare, получаем ошибку на Mikrotik
DoH server connection error: SSL: ssl: no trusted CA certificate found (6) [ignoring repeated messages]
Лечить можно так:
/tool fetch https://ssl.com/repo/certs/SSLcomRootCertificationAuthorityECC.pem /certificate import file-name=SSLcomRootCertificationAuthorityECC.pem passphrase="" /tool fetch https://ssl.com/repo/certs/SSLcomRootCertificationAuthorityRSA.pem /certificate import file-name=SSLcomRootCertificationAuthorityRSA.pem passphrase=""