Issue 32917 reported resolved in 8.5.1 is not resolved when DoH is enabled

Product Discussion
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The 8.5.1 release notes report issue 32917 resolved. For reference here is what is in the release notes:

32917: [System] Fixed an issue where the Local DNS Proxy used the hot standby WAN to resolve hostnames – All Models

Upgraded to 8.5.1 last Friday and today I checked usage on the backup cell connection which is in hot standby (standby priority 2). There was still over 40MB of usage per day even though the connection was never activated. I experimented and disabled DNS over HTTPS and now the traffic is completely gone from the cell backup link. This is on a B20x.
So I think issue 32917 has been resolved for normal DNS traffic, but is still a problem for DoH traffic, at least on the B20x. Please reopen the issue and get it resolved for the next release. Thank you.

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@peparn ,

We will review the issue and update you again.

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@peparn ,

Issue confirmed. When DoH enabled, the DNS proxy service will wrong using the hot standby WAN.

Targeted the fix will be added in coming firmware release 8.5.2.

Please create a ticket if you need a special firmware for the fix :wink:

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Hello @sitloongs, thank you for confirming the issue and queueing it for resolution in 8.5.2. No need for a special build, we just turned off DoH for now, that is not critical. We will turn it back on after 8.5.2 comes out in the coming months.
Thanks again for looking into it, and wishing you and the whole Peplink team Happy Holidays, Cheers!

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