客户端证书的SSL Connect错误和NSS错误-12263

Question

我已经配置了SSL证书，该证书将充当客户端证书，并通过SSL连接到端口100上的远程服务器。

在我的apache配置中，我为SSL完成了以下配置：

SSLProxyEngine on
SSLProxyVerify optional
SSLProxyCheckPeerCN off
SSLProxyCheckPeerExpire off


SSLProxyMachineCertificateFile          /opt/SP/apps/proxy/conf/certs/es_snf_prx_prd_cert.pem
SSLProxyCACertificateFile              /opt/SP/apps/proxy/conf/certs/esprx/vf_es_ca_cert_browser_exp.pem

为了测试我的SSL客户端证书，我尝试按以下所示通过curl连接到远程服务器，并收到SSL连接错误：

curl -vvvv --cert '/opt/SP/apps/proxy/conf/certs/es_snf_prx_prd_cert.pem' "https://47.60.13.249:100/"
* About to connect() to 47.60.13.249 port 100 (#0)
*   Trying 47.60.13.249... connected
* Connected to 47.60.13.249 (47.60.13.249) port 100 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* NSS error -12263
* Closing connection #0
* SSL connect error
curl: (35) SSL connect error

如何解决此问题并使用客户端证书测试与远程服务器的SSL连接？