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% docker-machine env
Error checking TLS connection: Error checking and/or regenerating the certs: There was an error validating certificates for host "192.168.99.104:2376": dial tcp 192.168.99.104:2376: i/o timeout
You can attempt to regenerate them using 'docker-machine regenerate-certs [name]'.
Be advised that this will trigger a Docker daemon restart which might stop running containers.
Finally I uninstalled, re-installed VirtualBox 6.1.26 and then docker-machine could again connect, and I saw the following entries in the route table:
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% netstat -rn | grep 192.168.99
192.168.99 link#18 UC vboxnet !
192.168.99.9 8:0:27:60:bf:23 UHLWI vboxnet 188
192.168.99.104 8:0:27:8c:c1:50 UHLWIi vboxnet 1187
Please comment on how to cope with new VirtualBox versions!