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ESET Endpoint Security 8.0.2028.0 blocking DNS on wired Ethernet


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When we deploy this to anyone, their device can no longer resolve anthing. This is when they use the 'Obtain DNS server automatically' IPv4 setting on the Ethernet NIC. They have to use static DNS settings for it to work.

When we roll back to 7.3.2044 it is resolved instantly,



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Do you use default firewall settings, ie. automatic mode without any custom rules? Does actually pausing the firewall make a difference?

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The way to diagnose this is as follows:

1. Set Ethernet IPv4 connection back to Obtain DNS server automatically.

2. Reboot device or do via command prompt window,  ipconfig /flushdns, ipconfig /release, and ipconfig /renew commands to reset IPv4 connection and acquire a new IPv4 lease.

3. Via command prompt window, enter ipconfig /all and note IPv4 DNS server assignment IP addresses.

4. Open Eset GUI and then Network protection.

5. Select Advanced. Then select Zones -> Edit.

In the DNS section, do you see the same IPv4 DNS server addresses noted in the prior ipconfig /all display?

Edited by itman
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case closed. was a custom firewall rule in wrong order that never impacted us until DNS fallback was removed in version 8. thanks folks.

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