It seems that One seems to be blocking Google DNS on my business UFB connection. If I manually set SDwan rules to use 2D connection it works, this has been happening for two days now. Is anyone else seeing similar issues?
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From my local machine it works. The DNS servers are getting "host unreachable" errors but if I ping 8.8.8.8 from the DNS servers it's happy. I have confirmed port 53 is open on the firewall, this was working fine and suddenly stopped. Nothing has changed apart from updates on the server.
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: apple.com
Address: 17.253.144.10
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