Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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Turning off Sophos XG DNS server stops resolution of hostname (using external DNS server)?

I'm using Sophos XG as my DHCP server but a separate device (Pi-hole) as my DNS server. Everything works fine and Pi-hole is functioning as expected. However, if I shut down the Sophos XG DNS service, I can no longer access any websites (i.e. no longer able to resolve hostnames). Why is this the case if I'm not using the Sophos XG DNS server? There is a thread here on reddit where a user was able to get it to work only by also using a separate DHCP server. I'm using CloudFlare (1.1.1.1 & 1.0.0.0) as my Upstream DNS servers in Pi-hole, so the Sophos XG DNS server should not be utilized at all.



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