Intermittent DNS lookup failures on RBR850

amenic
Apprentice
Sep 17, 2020
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

This isn't the problem. The modem is a 'dumb' modem, doesn't route, dhcp, dns etc.

Are you using custom DNS addresses or letting the RBR auto detect DNS from your ISP?

Custom, using openDNS as mentioned (was using the same service on my old netgear router I upgraded from and the same modem and never had this problem)

Has a factory reset and setup from scratch been performed since last FW update?

No factory reset yet. The problem is annoying but this MOSTLY works.
- Mikey94025
  Hero
  Sep 17, 2020
  This has been previously reported and plaguing other Orbi AX customers. IMO it is not something particularly wrong with your hardware unit and a problem in the latest firmware.
  https://community.netgear.com/t5/Orbi-AX/RBR850-frequently-issuing-DNS-REFUSED-responses/m-p/1926207/highlight/true#M4399
  https://community.netgear.com/t5/Orbi-AX/Intermittent-DNS-Errors-and-WiFi-Issues/m-p/1950768#M5458
  I see it very often while web browsing in my browser, where it quickly refreshes and tries again to display the page. I also see it exhibited when I go a URL bookmark for this Negear Community forum and intermittently (maybe 5%-10% of the time) it displays some Netgear forum Authentication error page and simply retrying then gets me in.
  - amenic
    Apprentice
    Sep 17, 2020
    Yea when it's really bad the Chromebooks will fail the "internet" check (always DNS) which makes the system think the Internet is down when it's not.
    
    I've also seen Windows fail this simlar check and think the NIC has no network connectivity BUT this doesn't stop it from working.

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Intermittent DNS lookup failures on RBR850