How to debug failed AWS elastic load balancer health checks

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I am at a loss trying to debug my ELB setup.

I have setup a load balancer with a single instance. I verified the configured health check works from the instance, and from another instance inside EC2. At this point I removed all possibly conflicting security group rules. Still the load balancer thinks the instance is not reachable.

I have copiously googled and gone through this checklist.

How can I get more information about the healthcheck failure? What is the closest thing I can do to sshing into the load balancer and reproducing the failure?

Thanks!

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