我试图建立一个Jenkins主节点和一个Jenkins从节点，其中Jenkins主节点位于另一台具有SSL终止的服务器上的Nginx反向代理之后。Nginx的配置如下：

upstream jenkins {
  server <server ip>:8080 fail_timeout=0;
}

server {
  listen 443 ssl;
  server_name jenkins.mydomain.com;
  ssl_certificate /etc/nginx/certs/mydomain.crt;
  ssl_certificate_key /etc/nginx/certs/mydomain.key;

  location / {
    proxy_set_header        Host $host:$server_port;
    proxy_set_header        X-Real-IP $remote_addr;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header        X-Forwarded-Proto $scheme;
    proxy_redirect          http:// https://;
    proxy_pass              http://jenkins;
  }
}

server {
  listen 80;
  server_name jenkins.mydomain.com;
  return 301 https://$server_name$request_uri;
}

在Jenkins主全局安全性配置中，JNLP代理的TCP端口设置为50000。端口50000设置为可从主机上的任何位置访问。

JNLP从站使用以下命令启动：

java -jar slave.jar -jnlpUrl https://jenkins.mydomain.com/computer/slave-1/slave-agent.jnlp -secret <secret>

JNLP从站无法连接到主站上已配置的JNLP端口：

INFO: Connecting to jenkins.mydomain.com:50000 (retrying:4)
java.net.ConnectException: Connection timed out
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:589)
        at java.net.Socket.connect(Socket.java:538)
        at hudson.remoting.Engine.connect(Engine.java:400)
        at hudson.remoting.Engine.run(Engine.java:298)

JNLP从站连接到Jenkins主站需要什么配置？