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I have a problem where the AWS ALB TCP is initiated and every request which causes unnecessary latency of 0-150ms Example from postman to show what happens at every request. DNS lookup, TCP Handshake and SSL handshake are all initiated

And when I access the instance directly. The aforementioned does not occur. Another example from postman

Thanks and any help is appreciated.

On the load balancer, I'm using the AWS certificates and since they can't get exported I'm using LetsEncrypt on the EC2 instances

Edit: How can I prevent the ALB from re-doing the handshakes and dns lookup

lat3r
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  • and what is the question? – AlexD Dec 22 '21 at 17:22
  • To note when accessing the load balancer using http:// (the ssl handshakes doesn't re-initiate at every request). The http listener just redirects to https with the same URI – lat3r Dec 22 '21 at 17:22
  • sorry @AlexD edited – lat3r Dec 22 '21 at 17:23
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Dec 31 '21 at 22:11

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Setting Desync mitigation mode to Monitor causes this to be solved. Found this just by experimenting with a different ALB. Hope this saves someone from the headache.

lat3r
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