SharePoint Online or OneDrive for Business backup jobs fail with “The remote server returned an error” warning

KB ID:
2745
Product:
Veeam Backup for Microsoft Office 365
Version:
2.0
Published:
Last Modified:
2020-02-13

Challenge

Backup jobs with SharePoint Online or OneDrive for Business items fail with the following errors:

Error: The remote server returned an error: (500) Internal Server Error.
Error: The remote server returned an error: (409) Conflict.

NOTE:
  • If you are experiencing these errors in versions higher than Veeam Backup for Microsoft Office 2.0, contact Technical Support.
  • Different error codes starting from version 3.0 my appear. For more information, see this KB article.

Cause

Items being backed-up might be blocked by the internal SharePoint Online antivirus. For more information, see this Microsoft article.

Solution

To check whether items are infected, open OneDrive or Site which cannot be backed-up and try to download files manually. If the files you are trying to download are infected, the following error appears.

User-added image

Rate the quality of this KB article: 
2.5 out of 5 based on 15 ratings

Couldn't find what you were looking for?

Below you can submit an idea for a new knowledge base article.

Report a typo on this page:

Please select a spelling error or a typo on this page with your mouse and press CTRL + Enter to report this mistake to us. Thank you!

Spelling error in text:

Submit