Backup Error: Request is not supported on Microsoft Windows

If you are getting the error “Request is not supported” when trying to perform a backup then you need to look at the computer that is trying to perform the backup.


The backup error “The Request is not supported” doesn’t really tell you much on a possible cause. I have seen this get triggered on Windows 2008 servers, non-R2 versions, on different types of backup software.

One thing to look at is the O/S that is running the backup software, if you are backing up across the network it’s not the data source machine that’s the problem.
There is a hotfix available under Microsoft KB 973278  that needs to be installed on the machine that is running the backup software, a reboot will be required.

KB 9783278 describes the symptoms:

On a computer that is running Windows Vista or Windows Server 2008, you have an application that uses the BackupRead function. When you try to use the application to read a file which is located on another computer that is not running Windows Vista or Windows Server 2008, the operation fails.

The hotfix can be installed on:

  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Ultimate
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Server 2008 Standard
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems

This will not work on Windows 2008 R2 versions.