This is worked. Finally, I done this and solved 502 error (Include Server Error show after search) with AWS ALB. Set the same value (60 seconds) for busyKeepAliveIdleTimeout and Connection idle timeout of ALB. Disabled HTTP/2 on ALB SHC of Splunk 7.3.3 and 8.2.8 both worked. I also found and verified this can solve error 502 of ALB. NLB -> ALB of Target Group Default value for busyKeepAliveIdleTimeout and Connection idle timeout of ALB. No need change any timeout settings. Ref. https://repost.aws/ja/knowledge-center/alb-static-ip
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