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This article describes the improvements and issues that are fixed in the Azure File Sync Agent v17 release that is dated December 2023. Additionally, this article contains installation instructions for this release.

Improvements and issues that are fixed

Sync upload performance improvements

Sync upload performance has improved (performance numbers to be posted in the near future). This improvement will mainly benefit file share migrations (initial upload) and high churn events on the server in which a large number of files need to be uploaded.

Expanded character support for file and directory names

Azure File Sync now supports an expanded list of characters. This expansion allows for users to create and sync SMB File shares with file and directory names on par with NTFS file system, for valid Unicode characters.  For more information on unsupported characters, refer to the documentation here.

New cloud tiering low disk space mode metric

You can now configure an alert if a server is in low disk space mode. To learn more, see Monitor Azure File Sync.

Fixed an issue that caused the agent update to hang

Miscellaneous reliability and telemetry improvements for cloud tiering and sync

More information about the Azure File Sync Agent v17 release

  • This release is available for Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, and Windows Server 2022 installations. 

  • Windows Server 2012 R2 requires .NET Framework version 4.6.2 or higher.

  • The agent version for this release is

How to obtain and install the Azure File Sync Agent

The Azure File Sync agent v17 release is no longer available due to the following security issue.

Unauthorized users might be able to create new files in locations they are not allowed.

This issue is fixed in the Azure File Sync agent v17.1 release.

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