# Error Responses
Common CDN error responses can be diagnosed by their HTTP Status Codes:
# 403 Forbidden
- Invalid Signed URL usage (when Signed URL is required) or
- Origin server returned 403 Forbidden
# 404 Not Found
- Origin server returned 404 Not Found
# 410 Gone
- Expired Signed URL access attempted (when Signed URL is required) or
- Origin server returned 410 Gone
# 451 Unavailable For Legal Reasons
- Client is accessing from a restricted region due to active Geoblocking
# 500 Internal Server Error
- Origin server returned 500 Internal Server Error or
- Technical error occurred within CDN Node operations
# 502 Bad Gateway
- Unable to establish connection with origin server
# 504 Gateway Timeout
- Connection to origin server established but response timeout exceeded