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Further info: my container exposes UDP port 6070. If I run the container through docker desktop I can connect e.g.

~$ nc -z -v -u 10.44.201.2 6070
Connection to 10.44.201.2 6070 port [udp/*] succeeded!

However the same container hosted through Rancher desktop gives me no response I'm running both on Windows

First question, do you have the config setting

experimental.virtualMachine.networkingTunnel

set to true?

yes I have set that. I get some TCP connectivity in my container (No UDP). I see no route for 6070 UDP port created in windows when using netstat. Wireshark then shows a response of port unreachable.