`dnsTunneling` not supported according to EventLog

[jantari]

Windows Version

10.0.19045.3693

WSL Version

2.0.9.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

5.15.133.1-microsoft-standard-WSL2

Distro Version

Ubuntu 22.04

Other Software

No response

Repro Steps

1. Use all the same versions as me (particularly Windows, WSL)
2. Create a ~/.wslconfig on the Windows side with the following content:

   [experimental]
   networkingMode=NAT
   dnsTunneling=true
   

3. Attempt to open an Ubuntu 22.04 WSL2 instance
4. It takes a bit longer than it should and a notification pops "Error starting WSL, see details in EventLog"
5. The Ubuntu 22.04 WSL2 instance does start, but dnsTunneling is not functioning

Expected Behavior

The Ubuntu instance should start in the usual (pre-enabling dnsTunneling) speed, no error notification should pop and dnsTunneling should work.

Actual Behavior

The Ubuntu instance takes a bit longer to start than before (no big deal), an error notification pops up and dnsTunneling does not work.

Diagnostic Logs

This is the XML view of the Event in EventLog. I am so terribly sorry for it being localized to german, but it was Microsofts' terrific idea to localize errors and event messages in this OS, not mine, so I am unfortunately unable to provide logs in english:

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="WSL" /> 
    <EventID Qualifiers="40960">0</EventID> 
    <Version>0</Version> 
    <Level>3</Level> 
    <Task>0</Task> 
    <Opcode>0</Opcode> 
    <Keywords>0x80000000000000</Keywords> 
    <TimeCreated SystemTime="2023-11-30T08:22:17.0503417Z" /> 
    <EventRecordID>49501</EventRecordID> 
    <Correlation /> 
    <Execution ProcessID="0" ThreadID="0" /> 
    <Channel>Application</Channel> 
    <Computer>NB-SERIALNUMBER.domain.local</Computer> 
    <Security /> 
  </System>
  <EventData>
    <Data>DNS-Tunneln wird nicht unterstützt</Data> 
  </EventData>
</Event>

[jantari]

I am also aware that the dnsTunneling feature requres both Windows 22H2+ and WSL 2.0.0+ according to:

1. This docs page https://learn.microsoft.com/en-us/windows/wsl/wsl-config#experimental-settings

   Entries with an ** after the value type require Windows version 22H2 or higher.

2. These release notes: https://github.com/microsoft/WSL/releases/tag/2.0.0
   which show that dnsTunneling was introduced in WSL 2.0.0

but I am running both of these so all requirements are met.

[OneBlue]

Indeed @jantari. DNS tunnelling is only supported on Windows 11 so this is why you're seeing this warning.

[jantari]

That's unfortunate, could the docs be fixed then?

They explicitly differentiate between features that require Windows 11 and features that require Windows 22H2:

Entries with an * after the value type are only available on Windows 11.

Entries with an ** after the value type require Windows version 22H2 or higher.

And dnsTunneling has two **, as such one expects it to work on Windows 10 22H2 as is documented.