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Applications taking minutes to start using certain upstream DNS servers

Paul Hutchings

Today we had a number of people reporting that applications were taking minutes to start where they usually take seconds, the apps are irrelevent, there were plenty of them.

The thing that was causing it was that we'd recently been testing some new DNS forwarders on our internal DNS servers.

We flicked them back to use root hints and everything is OK.

Why should this have caused that to happen?  It doesn't make sense as in an increasingly mobile world you have zero control what DNS servers your clients are using once they are off your internal network.

Is there an issue using Sophos with public DNS services such as 8.8.8.8 or 1.1.1.1?



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    Hi Paul,

    I know that the Cloudflare DNS (1.1.1.1) has been having some issues (too many legacy devices had these as default, thus the servers were getting a lot of junk traffic), I also use their back DNS (1.0.0.1).

    I ave not had any problems with DNS but the 2 you list are primaries and used all over the place, try using their backups and use their primarys for a backup (Just in case)

    hope this helps

    XG & UTM Architect (Systems: XG v18 & UTM 9.7 - Virtual, HW & SW)
    Curious enough to take it apart, skilled enough to put it back together, Clever enough to hide the extra parts when I'm Done!

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