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ClientTLSNegotiationErrorCount indicate the number of TLS connections initiated by clients towards the load balancer that were unsuccessful. Generally, this is happens when the client and load balancer could not agree on a cipher/protocol combination.
A few things are missing from the question:
- Do you have customer ALB's FQDN?
- What client does customer use? That SSL version and cipher suite does it use?
- Any particular error message the client saw before ALB RST the connection?
You mention that the issue happens in a particular internal network. Are the clients that same in the external and internal network? Does the internal network has any SSL proxy by any chance?
answered 4 years ago
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