wsl: Unknown key 'wsl2.hostAddressLoopback' in C:\Users\<username>\.wslconfig:9

[oldshensheep]

Windows Version

Microsoft Windows [Version 10.0.22635.2915]

WSL Version

2.0.15.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

Linux version 5.15.133.1-microsoft-standard-WSL2

Distro Version

ArchLinux

Other Software

No response

Repro Steps

my wslconfig in C:\Users<username>.wslconfig

[wsl2]
swap=0
memory=8G

dnsTunneling=true
firewall=true
autoProxy=true
networkingMode=mirrored
hostAddressLoopback=true

Expected Behavior

Working, as my Windows version is 23H2 > 22H2 https://learn.microsoft.com/en-us/windows/wsl/wsl-config#main-wsl-settings

Actual Behavior

wsl: Unknown key 'wsl2.hostAddressLoopback' in C:\Users<username>.wslconfig:9

Diagnostic Logs

No response

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[elsaco]

That feature is still experimental, as explained at https://learn.microsoft.com/en-us/windows/wsl/wsl-config#main-wsl-settings

Try:

[wsl2]
swap=0
memory=8G

dnsTunneling=true
firewall=true
autoProxy=true
networkingMode=mirrored

[experimental]
hostAddressLoopback=true

[oldshensheep]

@elsaco thanks, this worked. However, the document only mentions that autoMemoryReclaim and sparseVhd are experimental
see this https://learn.microsoft.com/en-us/windows/wsl/wsl-config#experimental-settings There may be a documentation error.