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Content Delivery Network

Status Codes and Solutions

Last updated: 2024-12-30 22:03:32
The table below explains the status codes of CDN.
Status Code
Meaning
Suggestion
400
HTTP request syntax error and the server cannot parse the request
Check whether the request syntax is correct.
403
Request is rejected
Check whether the request is blocked by access controls such as referer blocklist/allowlist, IP blocklist/allowlist, and authentication.
404
Server cannot return correct information
Check whether the original server is running normally, and whether the original server information or origin domain configurations are changed.
413
Content length of the POST request exceeds the limit
Check the content size of the POST request from the client (the maximum size is 32 MB by default).
414
URL length exceeds the limit
The maximum URL size is 2 KB by default.
423
Looping request
Check the 301/302 configuration, HTTPS origin-pull, and rewriting method of the origin server.
499
The client closes the connection
Check the client status and timeout configuration.
502
Gateway Error
Check whether the business origin server is normal.
503
COS frequency control is triggered
Check the cache configuration or whether the COS origin server returns no-cache/no-store.
509
Blocked due to CC attack
514
IP access frequency exceeds the limit
Check the IP access frequency control configuration in the CDN Console.
531
Error resolving the origin-pull domain name in the HTTP request
Check the domain name resolution configuration of the origin server.
532
Failed to establish a connection with the origin server in the HTTPS request
Check the port 443 status of the origin server, certificate configuration, or availability of the origin server.
533
Origin-pull connection timeout in the HTTPS request
Check the port 443 status of the origin server, certificate configuration, or availability of the origin server.
537
Origin server data reception timeout in the HTTPS request
Check the stability of the business origin server.
538
SSL handshake of HTTPS request failed
Check the compatibility between the origin server protocol and algorithm.
539
Certificate validation of HTTPS request failed
Check whether the certificate of the origin server is correctly configured (validity period and completeness of the certificate chain).
540
Certificate domain name validation of HTTPS request failed
Check whether the certificate of the origin server is correctly configured.
562
Failed to establish a connection in the HTTPS request
Please submit a ticket and provide the X-NWS-LOG-UUID information for troubleshooting.
563
Connection timeout in the HTTPS request
Please submit a ticket and provide the X-NWS-LOG-UUID information for troubleshooting.
564
HTTP origin request failed
If HTTP is configured as the origin request protocol, check the load and bandwidth utilization or access limit of the origin server. If the protocol is set to Follow Request, check the port 443 status and certificate configuration of the origin server. If no error is found in the origin server, please submit a ticket and provide the X-NWS-LOG-UUID information for troubleshooting.

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