Dnschecked not resolved

and some users can’t connect to the server

now another one failed…and when I change the dns server to the server which can’t resolve the domain,I can’t connect to the server

That looks like an issue at AT&T. The other major DNS providers (OpenDNS, Google, Quad9) are resolving it. Generally, I advise against using default DNS provided by an ISP, as they’re usually not very performant.

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