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# 对经典负载均衡器进行故障排除
<a name="elb-troubleshooting"></a>

下表列出了在您使用经典负载均衡器时可为您提供帮助的故障排除资源。


**API 错误**  

| 错误 | 
| --- | 
| [CertificateNotFound: 未定义](ts-elb-error-api-response.md#ts-elb-error-message-certificate) | 
| [OutofService: 发生了暂时性错误](ts-elb-error-api-response.md#ts-elb-error-message-service) | 


**HTTP 错误**  

| 错误 | 
| --- | 
| [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：请求超时](ts-elb-error-message.md#ts-elb-errorcodes-http408) | 
| [HTTP 502：无效网关](ts-elb-error-message.md#ts-elb-errorcodes-http502) | 
| [HTTP 503：服务不可用](ts-elb-error-message.md#ts-elb-errorcodes-http503) | 
| [HTTP 504：网关超时](ts-elb-error-message.md#ts-elb-errorcodes-http504) | 


**响应代码指标**  

| 响应代码指标 | 
| --- | 
| [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) | 


**运行状况检查问题**  

| 问题 | 
| --- | 
| [运行状况检查目标页面错误](ts-elb-healthcheck.md#ts-elb-healthcheck-targetpage) | 
| [与实例的连接超时](ts-elb-healthcheck.md#ts-elb-healthcheck-failed) | 
| [公钥身份验证失败](ts-elb-healthcheck.md#ts-elb-healthcheck-publickey) | 
| [实例未从负载均衡器接收流量](ts-elb-healthcheck.md#ts-elb-healthcheck-securitygroup) | 
| [实例上的端口未打开](ts-elb-healthcheck.md#ts-elb-healthcheck-ports) | 
| [Auto Scaling 组中的实例未通过 ELB 运行状况检查](ts-elb-healthcheck.md#ts-elb-healthcheck-autoscaling) | 


**连接问题**  

| 问题 | 
| --- | 
| [客户端无法连接到面向 Internet 的负载均衡器](ts-elb-connection-failed.md#client-cannot-connect) | 
| [负载均衡器无法接收发送到自定义域的请求](ts-elb-connection-failed.md#custom-domain-request) | 
| [发送到负载均衡器的 HTTPS 请求返回“NET:: ERR\$1CERT\$1COMMON\$1NAME\$1INVALID”](ts-elb-connection-failed.md#https-cert-invalid) | 


**实例注册问题**  

| 问题 | 
| --- | 
| [注册 EC2 实例时间过长](ts-elb-register-instance.md#ts-elb-register-too-long) | 
| [无法注册从已付 AMI 启动的实例](ts-elb-register-instance.md#ts-elb-paid-ami-instance) |