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DNS issue after uninstalling Sophos Endpoint Agent

Mark Ridler

We have noticed that when we have a computer that has a failed Sophos Central issue, for example, Missing Sophos AutoUpdate Service, after we have uninstalled Sophos and rebooted, the computer will no longer respond to DNS type requests!

For example:
Missing Sophos AutoUpdate Service displayed in Sophos Central
Attempting to reinstall using both the fat and thin version of the installer fails.
Ping to domain controller responds OK
Uninstall Sophos
Reboot
Ping domain controller via DNS name fails
Ping domain controller via IP address works
Other things such as RSOP.MSC fails as they computer cannot see the domain.

Windows Firewall is turned off

The fix we have found is to reimage the workstation.

Sophos has been working (as much as it ever does) on this machine until recently, this issue has only occurred over the last few days.

Anyone else have this issue?



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  • 0

    Hi Mark,

    This is definitely a weird issue.  Has anything changed in your environment since the problem started (the last few days as you mentioned)? 

    Are you behind a Firewall? Any chances made to that?  Or did any other network changes took place in the past few days? 

    Does the computer work before installing Sophos? (meaning, can you reach your domain and whatnot without any issues?) .

    Can you please provide more info about the environment that is being used? (OS, firewall, any specific policies). 

    Regards,

    Barb@Sophos
    Community Support Engineer | Sophos Technical Support
    Knowledge Base  |  @SophosSupport  | Sign up for SMS Alerts
    If a post solves your question use the 'This helped me' link.

     

  • 0

    Mark,

     

    I have this same issue on my laptop. However the only time I have the issue is on wireless. For me, I have not looked into this issue much as like you, it was easier to re-image a couple of machines with the latest release of windows 10. 

    I have left mine the way it is to hopefully come across the solution, as I have not had enough time to troubleshoot it myself. 

  • FormerMember
    0 FormerMember

    Hi Mark,

     

    Please run the following command netsh winsock reset and reboot the server also clear up DNS cache ipconfig /flushdns

     

    Let me know if this helps

     

    Amanjot Singh

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