Nginx ssl_verify_client和proxy_pass

我有2个Nginx服务器server1和server2.
server1需要客户端ssl验证.
server2代理对server1的所有请求

问题是当我试图直接从server1访问我的服务时,浏览器询问我的客户端证书,它工作正常

但是从servier2它总是给出错误“400 Bad Request.没有发送所需的SSL证书”

server1 nginx配置是

server {
listen       443;
server_name  server1 ;
ssl on;
ssl_certificate /etc/nginx/ssl/server.crt;
ssl_certificate_key /etc/nginx/ssl/server.key;
ssl_client_certificate /etc/nginx/client_keys/keys.crt;
ssl_verify_client on;
ssl_verify_depth 1;
ssl_session_timeout 5m;
ssl_protocols SSLv3 TLSv1;
ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP;
ssl_prefer_server_ciphers on;

location / {
    proxy_pass https://some-service;
}
}

server2 nginx配置是

server {
listen       443  default_server;
server_name  server2;
ssl on;
ssl_certificate /etc/nginx/ssl/server.crt;
ssl_certificate_key /etc/nginx/ssl/server.key;
ssl_client_certificate /etc/nginx/client_keys/keys.crt;
location / {
    proxy_pass https://server1;
}
}