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DNS timeouts go away when bypassing UTM

TimBenkert

Hello,

I'm running a Sophos Home appliance here which is doing DNS and DHCP for the whole network.

Now I am having trouble with DNS resolution.

I always get two timeouts when I do nslookup from my computer to google.de.

If I change the nameserver in the command to cloudflare (1.1.1.1) I receive an instant answer.

So something is going wrong. I followed BAlfsons DNS best practice guide but the problem persists.

I am running DNS with an availibilty group that contains Googles and Cloudflares DNS servers.

Additionally I have a request route for office365.com.

Clients have the UTm as primary DNS server and 1.1.1.1 as secondary.

This all works, but I am experiencing significant delays when I am browsing the internet. I turned of Intrusion Prevention but that did not do the trick.

Any ideas where I would have to look for further misconfiguration?

Thanks,

Tim



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    Hello Tim,

    please show us some screenshots fo the relevant DNS-config screens.

    Mit freundlichem Gruß, best regards from Germany,

    Philipp Rusch

    New Vision GmbH, Germany
    Sophos Silver-Partner

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to PhilippRusch

    Hey Philipp,

    sorry it so long with those screenshots, I struggled uploading them. In the end, I was just a little stupid as I did not klick the "upload" button. Anyway, screenshots are available now and help is still much appreciated.

    Best regards,

    Tim

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