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Hi Danny, enabling the traefik should not impact network tunnel feature. Have you tried a factory reset?

I just tried a factory reset. The default options are Enable networking tunnel off and Traefik on. At this point Rancher Desktop starts up OK. But as soon as I tick "Enable networking tunnel" the UI gets stuck at the "Updating kubeconfig" state again as I described above

is it possible that port 80 or 443 is occupied by another process on that machine?

I ran a

netstat -aon

command and yes there was something running on port 80. IIS was enabled on the host machine and the default website in there was listening on port 80. I stopped that and Rancher Desktop now starts up OK with both the networking tunnel and Traefik enabled. Thanks for your help!