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NLB-EC2構成を取ったときにTCP443にてCONNECT_CR_SRVR_HELLO:wrong version number

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###概要

AWSでクライアント証明書を使うために、NLB-EC2構成を取ったときに、Curlで叩くとよくわからないエラーCONNECT_CR_SRVR_HELLO:wrong version numberが発生

結論としてはTargetGroupのProxy2をONにしていたためチェックを外して解決した。

###現状

NLBはTCP80,443をそれぞれTargetGroupでそのままEC2に流している。

% curl -v --key private.pem --cert cert.crt -k "https://example.jp"
*   Trying xxx...
* TCP_NODELAY set
* Connected to example.jp (xxx) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/cert.pem
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* error:1400410B:SSL routines:CONNECT_CR_SRVR_HELLO:wrong version number
* Closing connection 0
curl: (35) error:1400410B:SSL routines:CONNECT_CR_SRVR_HELLO:wrong version number

proxy関係で同様のエラーが発生する模様

###TargetGroup修正

スクリーンショット 2021-06-08 11.28.56.png
なぜかProxy protocol v2が有効だったのでチェック外す。

% curl -v --key private.pem --cert cert.crt -k "https://example.jp"
*   Trying xxx...
* TCP_NODELAY set
* Connected to example.jp (xxx) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/cert.pem
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):

略

< HTTP/1.1 404 Not Found

とりあえず正常に通過しました。

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