DeviceLock DLP: 'The Group Policy snapin was unable to save changes due to the following error: The process cannot access the file because it is being used by another process.' error on attempt to add a new device to USB Devices White List using Group Pol

Description

An attempt to add a new device to USB Devices White List in Group Policy Editor fails with the The Group Policy snapin was unable to save changes due to the following error: The process cannot access the file because it is being used by another process. error.

Comments

By some reasons MMC cannot write to SYSVOL directory from the domain controller, which results in this problem.

The issue can be caused by a backup software on DC, removing it may eliminate the problem.