AWS NLB for Vault Server with empty response

Hey community,

I was testing a Vault server setup (HA) with trying both AWS NLB and ALB as entrypoint. Both are configured to terminate TLS and establish a TLS connection again to vault server which is listening on 443 and provides a TLS certificate.

The ALB just works fine, but the NLB returns an empty response from Vault server. Somehow I can’t get to the root of this and reaching out here for any potential help.