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First I'd get a tcpdump on one of the kubernetes boxes and see what's really going on at the network level.

One hunch is that ELBs don't like ephemeral ports and Kubernetes lives on them. Might be a mismatch here. ALBs are much more flexible with ports if that's an option.

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Kubernetes doesn't support ALBs natively yet, but there's a third party controller for them. The tcpdump approach is painful, but usually works.

Just for my sake what's ALB and ELB mean. I assume elastic load balanced and … load balancer?

Application load balancer

http://docs.aws.amazon.com/elasticloadbalancing/latest/appli... Gives a good overview of the two types

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