Could ISP DNS such as googles be part of the problem? Just curious because I did not notice the changes until a month or two after changing my ISP connection DNS to Googles. previously I had used the ISP given DNS. If we are looking a common settings... I also deliver DHCP to the clients using the meraki MX... along with AD DNS I allow 184.108.40.206 and of course 220.127.116.11 is also part of my servers set DNS. Curious to see what kind of feedback I get if people are willing to put for the effort.
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