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UTM 9.201-23 DNS Issues

kyle5281
Hey Guys: 

I have run into a new issue with 9.2. I'm not sure if it is a bug or what, but at least once every week DNS Resolution on the Gateway stops working and I have to go in and manually flush the cache for DNS resolution to start working again. I turned off DNSSEC Validation and will test with it off to see if that fixes the issue. Any advice would be greatly appreciated. 

My DNS Setup is: 
Clients -> Server -> Sophos -> OpenDNS

Thanks, 
Kyle


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  • 0
    Also i've seen waaay too many failures from UTM dns in regard to the http proxy. This causes mis categorizations of sites.

    I've not seen this, William.  Do you have an example that I can reproduce?

    If you really want to use a public dns I would highly suggest using hte dns routing feature to have the utm route internal dns to the internal dns server not itself..that way all external traffic will go outside and the internal traffic will get properly resolved by the internal dns server.

    Yes, this is item 4 in that post, using Request Routing to have internal FQDNs resolved.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
Reply
  • 0
    Also i've seen waaay too many failures from UTM dns in regard to the http proxy. This causes mis categorizations of sites.

    I've not seen this, William.  Do you have an example that I can reproduce?

    If you really want to use a public dns I would highly suggest using hte dns routing feature to have the utm route internal dns to the internal dns server not itself..that way all external traffic will go outside and the internal traffic will get properly resolved by the internal dns server.

    Yes, this is item 4 in that post, using Request Routing to have internal FQDNs resolved.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
Children
  • 0 in reply to BAlfson
    I've not seen this, William.  Do you have an example that I can reproduce?


    Yes, this is item 4 in that post, using Request Routing to have internal FQDNs resolved.

    Cheers - Bob


    check your pms.  I'm not going to castigate Sophos in public on this issue.

    Owner:  Emmanuel Technology Consulting

    http://etc-md.com

    Former Sophos SG(Astaro) advocate/researcher/Silver Partner

    PfSense w/Suricata, ntopng, 

    Other addons to follow

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