> ## Documentation Index
> Fetch the complete documentation index at: https://docs.go2proxy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Error code

> Introduction to error codes related to proxy products

## 1.Dynamic Residential Proxy

| HTTP Status Code | Reason Phrase                               | illustrate                                 |
| :--------------- | :------------------------------------------ | :----------------------------------------- |
| `407`            | Proxy Authentication Failed/White IP Failed | Username, password or whitelist error      |
| `413`            | Illegal Request                             | Request format error                       |
| `415`            | Request Over Limit                          | Concurrency exceeded                       |
| `416`            | Bandwidth Over Limit                        | Bandwidth exceeded                         |
| `418`            | Miss Host                                   | Unable to resolve destination host address |
| `419`            | Mainland China Access Not Permitted         | Mainland China client banned               |
| `421`            | DNS Resolution Failed                       | DNS resolution failed                      |
| `423`            | Public Host Required                        | Target host address non-public network ip  |
| `429`            | Insufficient Traffic                        | Insufficient order flow                    |
| `431`            | Unauthorized IP Usage                       | Use unauthorized ip                        |
| `503`            | Proxy Connect Error                         | Failed to connect to target host           |

## 2.Static Residential Proxy

| HTTP Status Code | Reason Phrase                               | illustrate                                 |
| :--------------- | :------------------------------------------ | :----------------------------------------- |
| `407`            | Proxy Authentication Failed/White IP Failed | Username, password or whitelist error      |
| `413`            | Illegal Request                             | Request format error                       |
| `415`            | Request Over Limit                          | Concurrency exceeded                       |
| `416`            | Bandwidth Over Limit                        | Bandwidth exceeded                         |
| `418`            | Miss Host                                   | Unable to resolve destination host address |
| `419`            | Mainland China Access Not Permitted         | Mainland China client banned               |
| `421`            | DNS Resolution Failed                       | DNS resolution failed                      |
| `423`            | Public Host Required                        | Target host address non-public network ip  |
| `431`            | Unauthorized IP Usage                       | Use unauthorized ip                        |
| `503`            | Proxy Connect Error                         | Failed to connect to target host           |