Alibaba Cloud CDN may return error messages in specific scenarios. You can visit the API Error Center to troubleshoot errors. This topic describes how to identify the causes of errors if you do not receive error messages and provides suggestions on how to fix the errors.
Note For a list of error codes, visit the API Error Center.
Basic features
Purchases and billing rules
- Why is the actual billed network traffic different from the network traffic reported by the logging feature?
- Why are fees still charged after I disable Alibaba Cloud CDN for my domain name?
- If my origin server is located outside the Chinese mainland, how am I billed for using Alibaba Cloud CDN POPs in the Chinese mainland?
- Billing of OSS content acceleration
- How is data transfer billed when Alibaba Cloud CDN is used with other Alibaba Cloud services?
- Where can I view details about resource plans that I have purchased?
- Why am I still charged for resources after I purchase resource plans of Alibaba Cloud CDN?
- FAQ about the billing of requests
- After I change the metering method of Alibaba Cloud CDN, why is Alibaba Cloud CDN still billed based on the previous metering method?
- Can RAM users change the billing method of Alibaba Cloud CDN?
- Am I charged for data transfer and requests that are generated by attacks or other malicious behaviors such as click farming?
- Am I charged if the requested CDN POP returns a 4xx status code?
Service unavailability and exceptions
- How do I troubleshoot an HTTP 5xx error that occurs during the back-to-origin process?
- Why does my website become unavailable after it is accelerated by Alibaba Cloud CDN?
- Why do users fail to retrieve files from a CDN point of presence (POP) or access my domain name?
- Why are requests redirected to a blank page instead of the desired URLs after my website is accelerated by Alibaba Cloud CDN?
- How do I determine whether errors occur on a CDN POP or the origin server?
- Why is content delivery outside the Chinese mainland not accelerated after I enabled acceleration for regions outside the Chinese mainland?
- Why are HTML files automatically downloaded when users access HTML files by using my domain name?
- Why do URL parameters fail to be loaded after my domain name is added to Alibaba Cloud CDN?
- What are the impacts on search engine optimization (SEO) after my website is accelerated by Alibaba Cloud CDN?
- Why do users fail to access WebSocket objects after my website is accelerated by Alibaba Cloud CDN?
- Why is the HTTP 304 status code returned when users access the resources that are accelerated by Alibaba Cloud CDN?
- Why is the HTTP 403 status code returned when users access the resources of Alibaba Cloud CDN?
- Why is the Content-Type request header changed to Content-Type: application/octet-stream and the page downloaded when a user accesses an HTML page?
- Why are connections automatically closed when users request large files by using Alibaba Cloud CDN?
- Why is content delivery of HTTPS-capable websites slow even when the local network works as expected?
- Why does the 404 Not Found page appear?
- What do I do if too many redirects occur after my domain name is accelerated by Alibaba Cloud CDN?
Domain name management and resolution
- Does Alibaba Cloud CDN support wildcard domain names?
- What are the impacts if I change the accelerated region of Alibaba Cloud CDN?
- How can I check whether a CNAME record takes effect?
- Grant the ListRoles permission to a RAM user
- How do I check whether a CDN POP works as expected?
- Why does a domain name fail ownership verification the first time that the domain name is added to Alibaba Cloud CDN?
- What do I do if my domain name does not have a valid ICP number?
- Why do users fail to access third-level domain names after I upload a certificate for the wildcard domain name?
- Why does the error message "The root domain is already used by another Alibaba Cloud account" appear the first time that a domain name is added to Alibaba Cloud CDN?
- Why does the error message "The CNAME binding service is unavailable because no enabled AccessKey pair is detected" appear when I configure a domain name in Alibaba Cloud CDN?
- How do I check whether an IP address belongs to an Alibaba Cloud CDN POP?
- What can I do if my DNS records conflict with each other?
- What can I do if my CNAME record does not take effect?
- Can I use an OSS bucket that belongs to another Alibaba Cloud account as the origin server when I add a domain name to Alibaba Cloud CDN?
Cache
- Why is the cache hit ratio low?
- Why did the cache hit ratio decrease when URLs in requests carry variables?
- How do I specify an NGINX cache policy?
- How do I specify an Apache cache policy?
- How do I specify an IIS cache policy?
- How do I use the inspect element feature of my browser to check whether content is cached?
- How do I disable caching policies for the directories or files of a specified domain name?
- How do I specify a time-to-live (TTL) value for the origin server when I use Alibaba Cloud CDN to accelerate the delivery of static content?
- Why is the content retrieved by users before and after content delivery is accelerated by Alibaba Cloud CDN different?
- Why is the cache hit ratio of a CDN POP decreased?
- How are CDN cache POPs classified?
- How do I handle the error message "Preload queue is full, please try again later"?
- How do I apply cache settings to a specified path?
- Why is content delivery slow after my website is accelerated by Alibaba Cloud CDN?
Back-to-origin routing and origin servers
- How can I query IP addresses of L2 POPs for a CDN domain?
- Why is the amount of back-to-origin network traffic large?
- Why is the number of requests redirected to the origin server greater than that of user requests?
- Why is the domain name accessed by users different from the domain name of the origin server that I configured in the Alibaba Cloud CDN console?
- How do I configure multiple origin servers for a domain name?
- What are the differences between an origin server and an origin host?
- Why do users fail to access my domain name by using cross-origin resource sharing (CORS) and trigger the following error message: The "Access-Control-Allow-Origin" header has a value "xxx" that is not equal to the supplied origin?
- Why is the content returned to a back-to-origin request not Gzip compressed?
- How does CDN process 302 redirects from an origin server?
- Who do I map the domain name of my website to the origin server when I troubleshoot errors?
- What is the health check mechanism for origin servers?
HTTPS
- How do I query the quota on HTTPS requests?
- How do I configure an intermediate SSL certificate for my accelerated domain name?
- Why do WeChat mini programs fail certification verification when the mini programs access Alibaba Cloud CDN?
- What can I do if my website prompts certificate-related risks?
- What can I do if the SSL certificate on the origin server conflicts with the one in Alibaba Cloud CDN?
- How can I configure an SSL certificate for a wildcard domain name?
- Which domain names support SSL certificates?
- How do I manage free SSL certificates after they expire?
- Why do requests fail to access resources over HTTPS after I enable Alibaba Cloud CDN?
Refresh and prefetch
- How do I use the SDK for Java to refresh the cache of Alibaba Cloud CDN?
- How do I update files without the need to rename the files after my domain name is accelerated by Alibaba Cloud CDN?
- How do I query the progress of a prefetch task?
- Why does the error message "504 Gateway Time-out" appear when users access my domain name?
- How do I use scripts to prefetch M3U8 files that are used for on-demand video streaming to CDN POPs?
Security
- How do I block malicious requests from specified IP addresses?
- Why is the HTTP 503 status code caused by the security features that are configured for the origin server returned when users access my domain name?
- Why is the HTTP 403 status code returned to users when hotlink issues are detected?
- Why can an IP address in the IP blacklist still be used to request resources?
- How can I protect domain names accelerated by Alibaba Cloud CDN from DDoS or HTTP flood attacks?
OSS
- Why do users fail to access Object Storage Service (OSS) buckets by using CORS when the OSS buckets are accelerated by Alibaba Cloud CDN?
- How do I use Alibaba Cloud CDN to accelerate the delivery of content in an OSS bucket?
- After I use Alibaba Cloud CDN to accelerate the delivery of content in an OSS bucket, why are files automatically downloaded when users access URLs?
- Why does CORS fail after I use Alibaba Cloud CDN to accelerate the delivery of content in an OSS bucket?
- How do I enable cross-origin resource sharing (CORS) for my website?
- What usage notes do I take note of when I configure CORS?
- Why do requests destined for my accelerated domain name trigger the error message "You are forbidden to list buckets" after access to private Object Storage Service (OSS) is enabled?
- What can I do if errors arise after I enable access to private OSS buckets and static website hosting?