当我测试域的负载平衡时,出现以下错误消息

问题描述

我遵循Google文档1。尝试用我的域测试LB时出现错误消息是很奇怪的 enter image description here

我已经检查了SD日志。请帮助解决这个问题。健康检查还可以

=====================
121.111.176.56 - "GET https://sangmin.org/" 502 450 "Mozilla/5.0 (X11; CrOS x86_64 13020.87.0) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/83.0.4103.119 Safari/537.36"
Expand all | Collapse all{
 httpRequest: {
  remoteIp: "121.111.176.56"   
  requestMethod: "GET"   
  requestSize: "1421"   
  requestUrl: "https://sangmin.org/"   
  responseSize: "450"   
  serverIp: "10.128.15.212"   
  status: 502   
  userAgent: "Mozilla/5.0 (X11; CrOS x86_64 13020.87.0) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/83.0.4103.119 Safari/537.36"   
 }
 insertId: "102ko8dg1zxvx9p"  
 jsonPayload: {
  @type: "type.googleapis.com/google.cloud.loadbalancing.type.LoadBalancerLogEntry"   
  statusDetails: "Failed_to_connect_to_backend"   
 }
 logName: "projects/lab-20181105/logs/requests"  
 receiveTimestamp: "2020-08-12T03:37:33.438671701Z"  
 resource: {
  labels: {
   backend_service_name: "my-backend-service"    
   forwarding_rule_name: "frontend-webserver"    
   project_id: "lab-20181105"    
   target_proxy_name: "webserver-group-target-proxy"    
   url_map_name: "webserver-group"    
   zone: "global"    
  }
  type: "http_load_balancer"   
 }
 severity: "WARNING"  
 spanId: "8246a7e11e075311"  
 timestamp: "2020-08-12T03:37:23.311748Z"  
 trace: "projects/lab-20181105/traces/a7a31a3e6f0c64716d405d5098449d89"  
}

1 https://cloud.google.com/iap/docs/tutorial-gce

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