通过Nginx代理转发，可实现==隐藏内网端口==进行访问，也适用于VPN场景中，具体步骤如下：

1.在Nginx配置中添加以下代码

server {
    listen 80;
    server_name doc.e-123.cn;

    location / {
        proxy_pass http://doc1.e-123.cn:7300;
        proxy_set_header Host $host;
        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;
    }

    access_log  /www/wwwlogs/doc_e123_access.log;
    error_log   /www/wwwlogs/doc_e123_error.log;
}

2.开启ssl访问

server {
    listen 80;
    listen 443 ssl http2;
    server_name doc.e-123.cn;

    #HTTP_TO_HTTPS_END
    ssl_certificate    /www/server/panel/ssl/doc.e-123.cn.pem;
    ssl_certificate_key    /www/server/panel/ssl/doc.e-123.cn.key;
    ssl_protocols TLSv1.1 TLSv1.2 TLSv1.3;

    location / {
        proxy_pass http://doc1.e-123.cn:7300;
        proxy_set_header Host $host;
        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;
    }

    access_log  /www/wwwlogs/doc_e123_access.log;
    error_log   /www/wwwlogs/doc_e123_error.log;
}

doc.e-123.cn.pem和doc.e-123.cn.key为证书文件

通过上面的设置，将使用域名doc.e-123.cn访问doc1.e-123.cn:7300的端口页面，从而实现隐藏端口的目的.