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host not found errors

alehman
Recently one of my appliance boxes has started producing numerous "host not found" errors to web clients. This started a few weeks ago about the time it upgraded to 9.006-5. I have several appliances on the same software revision that do not have this problem.

I have tried changing DNS forwarders and tried deleting all of the forwarders. I tried a Google forwarder as well. I tried disabling virus scanning also. There is nothing in the IPS logs. The DNS log shows the errors.

I opened a support case last week, but I was hoping for some troubleshooting hints while I wait for Sophos to respond.

Thanks,
Alan


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  • 0
    The Intrusion Prevention log also contains Anti-DoS Flooding activity - DNS traffic can be perceived as a UDP flood, depending on the configuration.

    How does your DHCP/DNS configuration compare to DNS Best Practice?

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0
    The Intrusion Prevention log also contains Anti-DoS Flooding activity - DNS traffic can be perceived as a UDP flood, depending on the configuration.

    How does your DHCP/DNS configuration compare to DNS Best Practice?

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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