how to debug "unknown: WSL" in journalctl?

[pocesar]

my log is currently full of those entries:

Mar 25 01:14:04 DEBIAN-WSL unknown: WSL (204) ERROR: CheckConnection: connect() failed: 101
Mar 25 01:13:44 DEBIAN-WSL unknown: WSL (204) ERROR: CheckConnection: getaddrinfo() failed: -5
Mar 25 01:13:44 DEBIAN-WSL unknown: WSL (204) ERROR: CheckConnection: getaddrinfo() failed: -5
Mar 25 01:13:44 DEBIAN-WSL unknown: WSL (204) ERROR: CheckConnection: connect() failed: 101
Mar 25 01:13:38 DEBIAN-WSL unknown: WSL (204) ERROR: CheckConnection: getaddrinfo() failed: -5
Mar 25 01:13:38 DEBIAN-WSL unknown: WSL (204) ERROR: CheckConnection: getaddrinfo() failed: -5
Mar 25 01:13:38 DEBIAN-WSL unknown: WSL (204) ERROR: CheckConnection: connect() failed: 101

the error code for connect, it's network unreachable.
is there any way to figure out what (service, process, module) is trying to resolve and connect and to where?

my .wslconfig:

[wsl2] 
ipv6=true
kernelCommandLine="cgroup_no_v1=all"
networkingMode=mirrored
nestedVirtualization=true
vmIdleTimeout=-1
firewall=true
dnsTunneling=true
autoProxy=true
virtio9p=false

for /etc/wsl.conf:

[boot]
systemd = true

[network]
hostname = "DEBIAN-WSL"
generateHosts = true
generateResolvConf = true

everything is working, can ping the host, can connect to listening services, use docker, etc. just annoyed by this mysterious error log that seems to be executing every 30 seconds or so.

[zcobol]

204 is the process ID of whatever is triggering the logging. Find out who's 204.

[pocesar]

there's no process with that PID 😭

[zcobol]

It was when journalctl recorded the message(s) otherwise there won't be WSL (204) in the logs. Check your logs in real time and see what process causing those issues. The process' numeric ID is in those log entries.

[pocesar]

I was using journalctl -f that number stays the same for every boot. shutting down WSL and starting it again just changes the number there, the errors are always the same

[OneBlue]

@pocesar: This is written by the /gns process, which runs in the root namespace (which is why you can't see it for your distro).

You can disable the connectivity checks by adding:

[wsl2]
telemetry=false

To .wslconfig

[OneBlue]

Also for future reference, you can interact with the root namespace by entering a debug shell, via; wsl --debug-shell