The following are the reputedly facing HTTP error codes.
| Error Code | Error Message | Error Description |
|---|---|---|
| 400 | Bad Request | The Request sent from the browser could not be understand by server |
| 401 | Unauthorized | Wrong Username and Password |
| 403 | Forbidden/Access Denied | The server refused to serve the page. IP restriction and Modsecurity blocking are possible reasons |
| 404 | Page Not Found | The request page is not available in the server |
| 502 | Proxy Server time out | Response from Backend application will take more time. Can see in Apache logs |
| 503 | Service unavailable | Backend application server instance may be down. Can see in Apache logs |
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