Problem description
After performing a SharePoint tenant domain rename, backups for some SharePoint sites fail on Druva inSync. The error displayed during backup attempts is:
Error: Unable to read file. Permission Denied Response Code: 404
Scenario:
Customer renamed the SharePoint tenant domain.
Subsequent backups failed for certain sites.
Manual backup worked after refreshing URLs.
Cause
Druva's backend uses cached URLs for configured SharePoint sites. After a domain rename, Microsoft updates the domain details instantly, but Druva requires time for the discovery refresh process to update the URLs in the backend. If a backup runs before this completion, the stale URLs return an HTTP 404 error, which is interpreted as a permission error.
Traceback
N/A (Specific code stack not relevant, error message captured in logs):
Error in logs:
Unable to read file. Permission Denied Response Code: 404
Resolution
Trigger Manual Backup:
From the Druva inSync Admin Console, select affected SharePoint sites and initiate a manual backup.
Confirm completion without errors.
Allow Discovery Refresh to Complete:
After a SharePoint domain rename, allow sufficient time for Druva discovery services to repopulate updated site URLs.
Avoid scheduling backups immediately after domain changes.
Preventive Tips:
Monitor Druva Reports and Alerts to identify failed sites post-domain rename.
Schedule critical backups only once discovery is verified to have completed.
Include and exclude filters
No changes to include/exclude filters are required for this issue
Verification
Navigate to Backup Reports in Druva Admin Console.
Confirm that previously failing SharePoint sites now show successful backup status.
Check job logs for absence of Permission Denied 404 errors.