Skip to main content
Question

Veeam m365 backup to Azure blob storage jobs all suddenly failing

  • November 7, 2025
  • 2 comments
  • 27 views

Since yesterday all our existing configured backup jobs to Azure Blob storage are failing and attempts to create new object storage repository are failing on Validating Credentials.  Error: Unable to access object storage (reason: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. (xstorageaccountnamex.blob.core.windows.net:443))

Any ideas?  I’ve tried rotating the access key in Azure and updating that in the Cloud account in Veeam m365 backup.  This has started to occur a week after upgrading to v8 which was ok initially.

2 comments

Chris.Childerhose
Forum|alt.badge.img+21
  • Veeam Legend, Veeam Vanguard
  • 9547 comments
  • November 7, 2025

What version as you using for VB365 as there is some new patches out recently?  Did you check the logs here C:\ProgramData\Veeam\Backup365

The logs are here and you may need to open a case with support.


regnor
Forum|alt.badge.img+14
  • Veeam MVP
  • 1382 comments
  • November 7, 2025

Hi ​@DomR!

As the connection to the block storages times out, I would suggest to start with basic troubleshooting. Are you able to access the internet from your VB365 server/proxy?

Make sure there’s no firewall or proxy preventing or intercepting the connection to the storage account. 

Also try to access it via a web browser and check if you’re seeing any errors; especially certificate or connection errors.