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How to debug failed AWS load balancing checks

I'm in trouble trying to debug my ELB setup.

I set up load balancing with one instance. I checked that the configured health check works from the instance, and from another instance inside EC2. At this point, I deleted all possible conflicting security group rules. However, the load balancer considers the instance to be unavailable.

I copiously searched googled and went through this checklist .

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

Thanks!

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Registered instances can perform a health check performed by your load balancer for one or more of the following reasons:

  • Problem: Instance (s) closing the connection to the load balancer.

    Reason: Balancing the elastic load terminates the connection if it has been idle for more than 60 seconds. An inactive connection is established when there is no read or write event on both sides of the balancing device (client for load balancing and load balancing on an external server).

    Solution: Set the downtime to at least 60 seconds in the instances you registered.

  • Problem: Response time responses.

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