Backup Azure SQLDatabase: Signature application is not valid

During backup of 3 azure sqldatabases in one (1) backup job, the second backup fails with the error “Signature application is not valid”.

The application version is 12.0.4.
The 3 databases are almost identical and has the same size.

I have tried to include only one database in the backup job: Some times it succeeds, and some time it fails with the same error.


This really is strange. After almost an hour everything seems to be ok - and yet it fails with this weird message.

Hi Jeol,

Thanks for the details. Could you please download the latest release of SQLBackupAndFTP from our website and reinstall it. You can download it at

Sorry for the inconvenience.

I have downloaded the latest version and tried a number of backups from Azure -> Local. I can confirm this problem seems to be solved.


Good news. Thanks fo the reply!

Please feel free to contact us on any issues or concerns.