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In case of dual-stack, kube-proxy tries to bind both IPv4 and IPv6 health check instances to the same address and port pair which causes the following error message in the log: 'bind: address already in use'. Fix the issue by binding IPv4 instance to a 'tcp4' socket and IPv6 instance to a 'tcp6' socket. Signed-off-by: Tero Kauppinen <tero.kauppinen@est.tech>