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| V17.3 Release - [KB5039814](https://support.microsoft.com/topic/97bd6ab9-fa4c-42c0-a510-cdb1d23825bf)| 17.3.0.0 | June 11, 2024 | Not Supported (Security Update) - Agent version expired on June 9, 2025 |
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| V17.3 Release - [KB5039814](https://support.microsoft.com/topic/97bd6ab9-fa4c-42c0-a510-cdb1d23825bf)| 17.3.0.0 | June 11, 2024 | Not Supported (Security Update) - Agent versions expired on June 9, 2025 |
| V17.2 Release - [KB5023055](https://support.microsoft.com/topic/dfa4c285-a4cb-4561-b0ed-bbd4ae09d91d)| 17.2.0.0 | February 28, 2024 | Not Supported - Agent version expired on June 9, 2025 |
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| V17.2 Release - [KB5023055](https://support.microsoft.com/topic/dfa4c285-a4cb-4561-b0ed-bbd4ae09d91d)| 17.2.0.0 | February 28, 2024 | Not Supported - Agent versions expired on June 9, 2025 |
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| V17.1 Release - [KB5023054](https://support.microsoft.com/topic/azure-file-sync-agent-v17-1-release-february-2024-security-only-update-bd1ce41c-27f4-4e3d-a80f-92f74817c55b)| 17.1.0.0 | February 13, 2024 | Not Supported - Agent version expired on June 9, 2025 |
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| V17.0 Release - [KB5023053](https://support.microsoft.com/topic/azure-file-sync-agent-v17-release-december-2023-flighting-2d8cba16-c035-4c54-b35d-1bd8fd795ba9)| 17.0.0.0 | December 6, 2023 | Not Supported - Agent version expired on June 9, 2025 |
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| V17.0 Release - [KB5023053](https://support.microsoft.com/topic/azure-file-sync-agent-v17-release-december-2023-flighting-2d8cba16-c035-4c54-b35d-1bd8fd795ba9)| 17.0.0.0 | December 6, 2023 | Not Supported - Agent versions expired on June 9, 2025 |
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## Unsupported versions
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@@ -78,82 +77,6 @@ Perform one of the following options for your Windows Server 2012 R2 servers pri
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>[!NOTE]
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>Azure File Sync agent v17.3 is the last agent release currently planned for Windows Server 2012 R2. To continue to receive product improvements and bug fixes, upgrade your servers to Windows Server 2016 or later.
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## Version 21.0.0.0
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The following release notes are for Azure File Sync version 21.0.0.0 (released June 23, 2025). This release contains improvements for the Azure File Sync service and agent.
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### Improvements and issues that are fixed
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**Generally Available: Azure File Sync in Italy North**
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The expansion into Italy North brings the service closer to organizations in these regions, offering lower latency, better performance, and support for local data residency requirements.
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**Granular Role-Based Access Control (RBAC) for Azure File Sync **
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Azure File Sync now includes two dedicated built-in RBAC roles [Azure File Sync Administrator](/azure/role-based-access-control/built-in-roles/storage#azure-file-sync-administrator) and [Azure File Sync Reader](/azure/role-based-access-control/built-in-roles/storage#azure-file-sync-reader), designed to strengthen security and streamline operations for organizations managing file synchronization between on-premises and cloud environments. These roles offer more granular access control than broader roles like Owner or Contributor, enabling organizations to enforce the principle of least privilege more effectively.
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**Miscellaneous reliability and telemetry improvements for cloud tiering and sync**
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Fixed an issue that caused sync download and cloud tiering failures with error code 0x80c80362 (ECS_E_ITEM_PATH_COMPONENT_HAS_ TRAILING_DOT) when a file or folder path included a trailing dot. Previously, users had to manually rename the affected item to resume sync. Azure File Sync now correctly handles path components with trailing dots, eliminating the need for manual intervention.
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### Evaluation Tool
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Before deploying Azure File Sync, you should evaluate whether it's compatible with your system using the Azure File Sync evaluation tool. This tool is an Azure PowerShell cmdlet that checks for potential issues with your file system and dataset, such as unsupported OS version. For installation and usage instructions, see [Evaluation Tool](file-sync-planning.md#evaluation-cmdlet) section in the planning guide.
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### Agent installation and server configuration
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For more information on how to install and configure the Azure File Sync agent with Windows Server, see [Planning for an Azure File Sync deployment](file-sync-planning.md) and [How to deploy Azure File Sync](file-sync-deployment-guide.md).
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- The agent installation requires a restart for servers that have an existing Azure File Sync agent installation if the agent version is older than 18.2.0.0.
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- The agent installation package must be installed with elevated (admin) permissions.
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- The agent isn't supported on Nano Server deployment option.
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- The agent is supported only on Windows Server 2016, Windows Server 2019, Windows Server 2022 and Windows Server 2025.
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- The Azure File Sync agent installation package is specific to the operating system version. If you're upgrading a server to a newer version of Windows Server, you must first uninstall the Azure File Sync agent and restart the server. ***Don't unregister and re-register the server during the OS upgrade, or it will lead to orphaned tiered files on existing server endpoints.*** Then, upgrade the operating system to the new version. After the upgrade is complete, install the Azure File Sync agent that matches the new Windows Server version such as 2016, 2019, 2022, or 2025. After installing the agent on the upgraded server, the Azure portal should reflect the correct server status within 30 minutes.
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- The agent requires at least 2 GiB of memory. If the server is running in a virtual machine with dynamic memory enabled, the VM should be configured with a minimum 2048 MiB of memory. See [Recommended system resources](file-sync-planning.md#recommended-system-resources) for more information.
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- The agent uses TLS 1.2 or 1.3 (Windows Server 2022 or newer) by default and TLS 1.0 and 1.1 are not supported.
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- Server registration using the [Register-AzStorageSyncServer](/powershell/module/az.storagesync/register-azstoragesyncserver) and ServerRegistration.exe require .NET Framework 4.7.2. or higher
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- The Storage Sync Agent (FileSyncSvc) service doesn't support server endpoints located on a volume that has the system volume information (SVI) directory compressed. If the SVI directory is compressed, the Storage Sync Agent (FileSyncSvc) service will fail to start.
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- Agent installation can fail with error **0x80c84111** if required Windows security updates are missing. To prevent this issue, make sure the following updates are installed based on your server version:
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- Windows Server 2012 R2: [KB5021653](https://support.microsoft.com/topic/kb5021653-out-of-band-update-for-windows-server-2012-r2-november-17-2022-8e6ec2e9-6373-46d7-95bc-852f992fd1ff)
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- Windows Server 2016: [KB5040562](https://support.microsoft.com/topic/kb5040562-servicing-stack-update-for-windows-10-version-1607-and-server-2016-july-9-2024-281c97b9-c566-417e-8406-a84efd30f70c)
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- Windows Server 2019: [KB5005112](https://support.microsoft.com/topic/kb5005112-servicing-stack-update-for-windows-10-version-1809-august-10-2021-df6a9e0d-8012-41f4-ae74-b79f1c1940b2) and [KB5040430](https://support.microsoft.com/topic/july-9-2024-kb5040430-os-build-17763-6054-0bb10c24-db8c-47eb-8fa9-9ebc06afa4e7)
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### Interoperability
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- Antivirus, backup, and other applications that access tiered files can cause undesirable recall unless they respect the offline attribute and skip reading the content of those files. For more information, see [Troubleshoot Azure File Sync](/troubleshoot/azure/azure-storage/file-sync-troubleshoot?toc=/azure/storage/file-sync/toc.json).
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- File Server Resource Manager (FSRM) file screens can cause endless sync failures when files are blocked because of the file screen.
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- Running sysprep on a server that has the Azure File Sync agent installed isn't supported and can lead to unexpected results. The Azure File Sync agent should be installed after deploying the server image and completing sysprep mini-setup.
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### Sync limitations
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The following items don't sync, but the rest of the system continues to operate normally:
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- Azure File Sync supports all characters that are supported by the [NTFS file system](/windows/win32/fileio/naming-a-file) except invalid surrogate pairs. See [Troubleshooting guide](/troubleshoot/azure/azure-storage/file-sync-troubleshoot-sync-errors?toc=/azure/storage/file-sync/toc.json#handling-unsupported-characters) for more information.
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- Paths that are longer than 2,048 characters.
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- The system access control list (SACL) portion of a security descriptor that's used for auditing.
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- Extended attributes.
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- Alternate data streams.
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- Reparse points.
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- Hard links.
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- Compression (if it's set on a server file) isn't preserved when changes sync to that file from other endpoints.
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- Any file that's encrypted with EFS (or other user mode encryption) that prevents the service from reading the data.
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> [!NOTE]
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> Azure File Sync always encrypts data in transit. Data is always encrypted at rest in Azure.
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### Server endpoint
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- A server endpoint can be created only on an NTFS volume. ReFS, FAT, FAT32, and other file systems aren't currently supported by Azure File Sync.
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- Cloud tiering isn't supported on the system volume. To create a server endpoint on the system volume, disable cloud tiering when creating the server endpoint.
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- Failover Clustering is supported only with clustered disks, but not with Cluster Shared Volumes (CSVs).
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- A server endpoint can't be nested. It can coexist on the same volume in parallel with another endpoint.
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- Don't store an OS or application paging file within a server endpoint location.
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### Cloud endpoint
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- Azure File Sync supports making changes to the Azure file share directly. However, any changes made on the Azure file share first need to be discovered by an Azure File Sync change detection job. A change detection job is initiated for a cloud endpoint once every 24 hours. To immediately sync files that are changed in the Azure file share, use the [Invoke-AzStorageSyncChangeDetection](/powershell/module/az.storagesync/invoke-azstoragesyncchangedetection) PowerShell cmdlet to manually initiate the detection of changes in the Azure file share.
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- The storage sync service and/or storage account can be moved to a different resource group, subscription, or Microsoft Entra (formerly Azure AD) tenant. After moving the storage sync service or storage account, you need to give the Microsoft.StorageSync application access to the storage account (see [Ensure Azure File Sync has access to the storage account](/troubleshoot/azure/azure-storage/file-sync-troubleshoot-sync-errors?toc=/azure/storage/file-sync/toc.json#troubleshoot-rbac)).
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> [!NOTE]
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> When creating the cloud endpoint, the storage sync service and storage account must be in the same Microsoft Entra ID tenant. After you create the cloud endpoint, you can move the storage sync service and storage account to different Microsoft Entra ID tenants.
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### Cloud tiering
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- If a tiered file is copied to another location by using Robocopy, the resulting file isn't tiered. The offline attribute might be set because Robocopy incorrectly includes that attribute in copy operations.
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- When copying files using Robocopy, use the /MIR option to preserve file timestamps. This will ensure older files are tiered sooner than recently accessed files.
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## Version 20.0.0.0
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The following release notes are for Azure File Sync version 20.0.0.0 (released February 10, 2025). This release contains improvements for the Azure File Sync service and agent.
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