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Copy file name to clipboardExpand all lines: support/azure/azure-storage/files/file-sync/file-sync-troubleshoot-installation.md
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@@ -3,8 +3,7 @@ title: Troubleshoot Azure File Sync agent installation and server registration
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description: Troubleshoot common issues with installing the Azure File Sync agent and registering Windows Server with the Storage Sync Service.
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author: khdownie
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ms.service: azure-file-storage
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ms.topic: troubleshooting
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ms.date: 04/29/2025
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ms.date: 04/30/2025
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ms.author: kendownie
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ms.custom: sap:File Sync
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---
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This issue occurs due to a known issue that has been fixed in File Sync Agent v19.1. To resolve this issue, install the latest version of the agent.
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**Server Registration displays the message: "System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=..."**
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This error occurs when the server lacks the required .NET Framework version. Azure File Sync's server registration requires .NET Framework 4.7.2 or a later version to function properly.
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**Server Registration displays the following message: "System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=..."**
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This error occurs when the required version of the .NET Framework is missing on the server. Azure File Sync's server registration requires **.NET Framework 4.7.2. or higher** to function properly.
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To resolve the issue:
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1. Downland and install .NET Framework 4.7.2. or higher.
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2. Restart the server after installation.
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3. Retry the server registration using the Server Registration UI or PowerShell.
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To resolve the issue, follow these steps:
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1. Downland and install .NET Framework 4.7.2 or a later version.
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2. Restart the server after the installation.
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3. Retry the server registration using the server registration UI or PowerShell.
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**Server registration fails with error: operation returned an invalid status code 'Unauthorized'**
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During server registration, if you encounter the following error:
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`Operation returned an invalid status code 'Unauthorized'`
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During server registration, you might encounter the following error:
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This issue occurs due to a bug in the Azure File Sync v20 agent. To work around this issue, manually register the server using PowerShell:
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> Operation returned an invalid status code 'Unauthorized'
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This issue occurs due to a bug in the Azure File Sync v20 agent. To work around this issue, manually register the server by running the following PowerShell commands:
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