本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 故障診斷 Classic Load Balancer
<a name="elb-troubleshooting"></a>

下表列出故障診斷資源，有助您尋找使用 Classic Load Balancer 的實用資訊。


**API 錯誤**  

| 錯誤 | 
| --- | 
| [CertificateNotFound：未定義](ts-elb-error-api-response.md#ts-elb-error-message-certificate) | 
| [OutofService：發生暫時性錯誤](ts-elb-error-api-response.md#ts-elb-error-message-service) | 


**HTTP 錯誤**  

| 錯誤 | 
| --- | 
| [HTTP 400: BAD\$1REQUEST](ts-elb-error-message.md#ts-elb-errorcodes-http400) | 
| [HTTP 405: METHOD\$1NOT\$1ALLOWED](ts-elb-error-message.md#ts-elb-errorcodes-http405) | 
| [HTTP 408：請求逾時](ts-elb-error-message.md#ts-elb-errorcodes-http408) | 
| [HTTP 502：無效的閘道](ts-elb-error-message.md#ts-elb-errorcodes-http502) | 
| [HTTP 503：服務無法使用](ts-elb-error-message.md#ts-elb-errorcodes-http503) | 
| [HTTP 504：閘道逾時](ts-elb-error-message.md#ts-elb-errorcodes-http504) | 


**回應代碼指標**  

| 回應代碼指標 | 
| --- | 
| [HTTPCode\$1ELB\$14XX](ts-elb-http-errors.md#ts-elb-error-metrics-ELB_4XX) | 
| [HTTPCode\$1ELB\$15XX](ts-elb-http-errors.md#ts-elb-error-metrics-ELB_5XX) | 
| [HTTPCode\$1Backend\$12XX](ts-elb-http-errors.md#ts-elb-error-metrics-Backend_2XX) | 
| [HTTPCode\$1Backend\$13XX](ts-elb-http-errors.md#ts-elb-error-metrics-Backend_3XX) | 
| [HTTPCode\$1Backend\$14XX](ts-elb-http-errors.md#ts-elb-error-metrics-Backend_4XX) | 
| [HTTPCode\$1Backend\$15XX](ts-elb-http-errors.md#ts-elb-error-metrics-Backend_5XX) | 


**運作狀態檢查問題**  

| 問題 | 
| --- | 
| [運作狀態檢查目標頁面錯誤](ts-elb-healthcheck.md#ts-elb-healthcheck-targetpage) | 
| [與執行個體的連線已經逾時。](ts-elb-healthcheck.md#ts-elb-healthcheck-failed) | 
| [公有金鑰身分驗證失敗](ts-elb-healthcheck.md#ts-elb-healthcheck-publickey) | 
| [執行個體不會接收負載平衡器的流量](ts-elb-healthcheck.md#ts-elb-healthcheck-securitygroup) | 
| [執行個體上未開啟連接埠](ts-elb-healthcheck.md#ts-elb-healthcheck-ports) | 
| [Auto Scaling 群組中的執行個體未通過 ELB 運作狀態檢查](ts-elb-healthcheck.md#ts-elb-healthcheck-autoscaling) | 


**連線問題**  

| 問題 | 
| --- | 
| [用戶端無法連接到面向網際網路的負載平衡器](ts-elb-connection-failed.md#client-cannot-connect) | 
| [負載平衡器不會收到傳送至自訂域的請求](ts-elb-connection-failed.md#custom-domain-request) | 
| [傳送至負載平衡器的 HTTPS 要求會傳回 "NET::ERR\$1CERT\$1COMMON\$1NAME\$1INVALID"](ts-elb-connection-failed.md#https-cert-invalid) | 


**執行個體註冊問題**  

| 問題 | 
| --- | 
| [時間太長而無法註冊 EC2 執行個體](ts-elb-register-instance.md#ts-elb-register-too-long) | 
| [無法註冊從已支付 AMI 啟動的執行個體](ts-elb-register-instance.md#ts-elb-paid-ami-instance) |