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What are the common causes of CDN errors?

Created on 2025-07-08 14:12:35
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Common causes of CDN (Content Delivery Network) errors include:

  1. Misconfigured DNS Settings: Incorrect DNS records can prevent users from accessing the CDN, leading to errors like "404 Not Found" or "DNS Resolution Failed."

    • Example: If the CNAME record points to an invalid CDN endpoint, requests won’t be routed properly.

  2. Cache Invalidation Issues: Stale or improperly invalidated cached content can serve outdated files, causing inconsistencies.

    • Example: Updating a website’s image but failing to purge the CDN cache may display the old version.

  3. Network or Connectivity Problems: Issues between the origin server and CDN nodes (e.g., DDoS attacks, routing errors) can disrupt content delivery.

    • Example: A regional network outage may block CDN nodes from fetching fresh content from the origin.

  4. Origin Server Failures: If the origin server is down or slow to respond, the CDN may return errors like "502 Bad Gateway" or "504 Gateway Timeout."

    • Example: A database crash on the origin server prevents the CDN from retrieving dynamic content.

  5. CDN Configuration Errors: Incorrect caching rules, TTL settings, or HTTPS configurations can lead to delivery failures.

    • Example: Setting a very short TTL for static assets may overload the origin with frequent requests.

For mitigating such issues, Tencent Cloud CDN offers features like real-time monitoring, intelligent cache purging, and HTTPS acceleration to ensure reliable content delivery. Its global network and DDoS protection also help minimize downtime.