The table below explains the status codes of CDN.
|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||Please submit a ticket|
|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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