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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Flow Control Blocking DNS?

tsull360

Hello,

I've got a scenario where seemingly randomly clients from my workstation vlan will be unable to contact my DNS server in the server vlan. I can ping the DNS server, but am unable to get responses. This lasts for about 30 seconds before functionality resumes. I've ran continuous tests from the DNS server, but never see a drop in its ability to resolve queries.

What/where can I look on Sophos to see if something is being blocked or throttled?

Thanks!



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    Hi,

    Thanks for choosing Sophos.

    To capture what is dropping through Firewall, take the Shell access to UTM and go to option 4. Device console.

    Type the following command, console> drop-packet-capture 'host x.x.x.x (IP Address)

    If you do not understand the log lines anywhere, post them to me :)

    Thanks

    Sachin Gurung

    Sachin Gurung
    Team Lead | Sophos Technical Support
    Knowledge Base  |  @SophosSupport  |  Video tutorials
    Remember to like a post.  If a post (on a question thread) solves your question use the 'This helped me' link.

Reply
  • 0

    Hi,

    Thanks for choosing Sophos.

    To capture what is dropping through Firewall, take the Shell access to UTM and go to option 4. Device console.

    Type the following command, console> drop-packet-capture 'host x.x.x.x (IP Address)

    If you do not understand the log lines anywhere, post them to me :)

    Thanks

    Sachin Gurung

    Sachin Gurung
    Team Lead | Sophos Technical Support
    Knowledge Base  |  @SophosSupport  |  Video tutorials
    Remember to like a post.  If a post (on a question thread) solves your question use the 'This helped me' link.

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