Help Center/ Object Storage Service/ FAQs/ Back to Source/ How Do I Troubleshoot a Back-to-Source Failure?
Updated on 2026-08-20 GMT+08:00
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How Do I Troubleshoot a Back-to-Source Failure?

If the back-to-source fails, perform the following steps:

  1. Check whether the origin server can be connected. 
    curl -I https://testexample.com/file/test.txt

    If the back-to-source address is a private bucket address, ensure that you have the permission to access the bucket.

  2. Check the DNS resolution of the origin server domain name. 
    nslookup testexample.com
  3. If the origin server uses HTTPS, check whether the HTTPS certificate is available (for example, whether it has expired).
  4. Analyze the problem based on the log files generated by the bucket. For details about bucket log files, see Using Logging to Record OBS Logs.
Parent topic: Back to Source