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But rancher is not running on that Ubuntu WSL2, right? So it cannot be on 127.0.0.1, but on IP address of the Windows host

No, rancher desktop is in separate wsl2 instance: wsl -l Ubuntu-20.04 (výchozí) rancher-desktop-data rancher-desktop This was just an example running default kubectl command. I tried curl https://172.29.80.1:6443/api (ip address in /etc/resolv.conf). I also tried IP address of windows host on network, IP addresses Ethernet adapter vEthernet (Default Switch), Ethernet adapter vEthernet (WSL), IPv6 address, it just goes to timeout.

Hi, have do you have the new experimental network tunnel enabled?

Yes, it was enabled, now everything works ok. Thanks!