If an error occurs while using Alibaba Cloud CDN, see CDN - Error Codes for solutions. If you do not receive a specific error message, find your issue in the categories below.
For more information about common CDN errors, see CDN - Error Codes.
Basic features
Purchases and billing
How am I billed for traffic when I use Alibaba Cloud CDN with other Alibaba Cloud services?
Why do I still incur charges after purchasing a resource plan?
Why am I still billed according to the previous method after changing my billing method?
Can a RAM user change the billing method for Alibaba Cloud CDN?
Am I charged for traffic and requests generated by attacks or malicious activities?
Service unavailability and exceptions
Why is my website unavailable after enabling CDN acceleration?
Why can't I retrieve files from a POP or access my domain name?
Why does accessing a URL return a blank page after I enable CDN acceleration?
How to determine if an access issue is caused by a POP or your origin server
Why does activating overseas POPs not improve access speed for overseas users?
Why do URL parameters fail to load after I add a domain name to CDN?
Why is a 403 status code returned when I access CDN resources?
Troubleshooting slow access to HTTPS websites with a stable local network
Domain name management and resolution
Cache
Why does using variable parameters in URLs lower the cache hit ratio?
Set cache expiration on the origin server for static resources
Why is content from Alibaba Cloud CDN different from the content on the origin server?
How do I handle the "Prefetch queue is full" error when prefetching URLs?
Why is website access slow after I enable Alibaba Cloud CDN acceleration?
Back-to-origin and origin servers
Why is my back-to-origin traffic greater than the access traffic?
Why is the accessed domain name different from the origin server I configured in the console?
What is the difference between an origin host and an origin server in CDN?
Why is Gzip compression not enabled for back-to-origin requests through CDN?
Point a domain name to the origin server for troubleshooting
What is Alibaba Cloud CDN's health check mechanism for origin servers?
HTTPS
Why does certificate validation fail when a WeChat mini program accesses CDN?
What should I do if the HTTPS certificate on the origin server conflicts with the one on CDN?
What should I do after my free personal test certificate expires?
Why are resources inaccessible over HTTPS when accelerated by CDN?