New [top]: Microsoftwindowsnetfx3ondemandpackagecab Download Server 2012 R2

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs Use code with caution. Copied to clipboard /All : Enables all parent features of .NET 3.5.

Online install via Windows Update

By following this guide, you now have the knowledge and tools to tackle any .NET Framework 3.5 installation on your Windows Server 2012 R2 infrastructure, ensuring legacy applications and critical services run without a hitch.

To revert the change after the .NET installation: To revert the change after the

: The .cab file is located at D:\sources\sxs (replace D: with your actual drive letter).

Windows Server 2012 R2 strips out legacy components like .NET 3.5 (which includes .NET 2.0 and 3.0) to reduce disk footprint. When you try to enable it via Server Manager, Windows attempts to contact Windows Update to download the missing payload. If your server is offline, behind a strict firewall, or managed by an internal WSUS server that does not host these files, the installation fails. 🛠️ Step 1: Extract the CAB File from Official Media

Download the official en_windows_server_2012_r2_with_update_x64_dvd_4065220.iso (or similar) from the Visual Studio Subscriptions (formerly MSDN) or Volume Licensing Service Center. Inside the ISO, navigate to \sources\sxs\ . The file is named microsoft-windows-netfx3-ondemand-package.cab . If your server is offline, behind a strict

Is your server completely or connected to a WSUS server ?

Install from local SxS folder: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs

Note: PowerShell will scan the source path for the CAB automatically if properly named. To fix this: Open gpedit.msc .

dism /online /enable-feature /featurename:NetFx3 /all /source:C:\NetFx3 /LimitAccess Use code with caution.

PowerShell provides a more modern command-line alternative.

Installing .NET Framework 3.5 on Windows Server 2012 R2 often fails with error code or 0x800F081F . This happens because the source files are not present in the local side-by-side (SxS) store of the operating system. To resolve this, you need the specific Feature on Demand CAB file: microsoft-windows-netfx3-ondemandpackage~31bf3856ad364e35~amd64~~.cab . 🛑 Why the Direct Download Missing Error Happens

If your server is connected to a WSUS server, Group Policy might prevent downloading optional features. To fix this: Open gpedit.msc .