Microsoftwindowsnetfx3ondemandpackagecab Download Server 2012 R2 New [exclusive] Guide

The file microsoft-windows-netfx3-ondemand-package.cab is the specific cabinet file required to install .NET Framework 3.5 on Windows Server 2012 R2 when the server lacks internet access or the standard installation fails. Primary Installation Method (Recommended)

Instead of downloading a standalone .cab from third-party sites, which can be risky, the official and safest way to obtain this package is from your Windows Server 2012 R2 installation media.

Locate the File: Insert or mount your Windows Server 2012 R2 ISO.

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

Run DISM Command: Open an elevated Command Prompt and execute the following: The file microsoft-windows-netfx3-ondemand-package

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.

/LimitAccess: Prevents DISM from trying to contact Windows Update.

/Source: Points directly to the location of the .cab package. Troubleshooting Common Errors

If the installation fails (often with errors like 0x800F0906 or 0x800F081F), consider these fixes: Install Net Framework 3.5 SP1 Offline on Server 2012 R2 Windows Server 2012 R2 has a “Features on

Installing .NET Framework 3.5 on Windows Server 2012 R2 often fails because the source files aren't kept on the local disk to save space. The standard way to fix this is by using the microsoft-windows-netfx3-ondemand-package.cab file, which is found in the \sources\sxs folder of the original Windows Server 2012 R2 installation media. Option 1: The Quick Command Line Fix

If you have the installation media (ISO or DVD) mounted as drive D:, run this command in an Administrator Command Prompt:

dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution. Copied to clipboard /Source: Tells Windows exactly where the .cab file is.

/LimitAccess: Prevents the server from trying to download files from Windows Update/WSUS, which often causes the 0x800F0954 error. Option 2: Using Server Manager (GUI) Technical Write-Up: Installing

If you prefer a visual walkthrough, use the Add Roles and Features Wizard as detailed on Microsoft Learn:

This guide addresses how to obtain and install the .NET Framework 3.5 feature on Windows Server 2012 R2, specifically focusing on the "Feature on Demand" method (using the .cab file) which avoids the need for Windows Update internet access.

Since Microsoft does not provide a direct public link to download a standalone .cab file (like microsoft-windows-netfx3-ondemand-package.cab) outside of the Windows Installation Media, you must extract it from the Server 2012 R2 ISO.

Here is the step-by-step guide.

Why use the OnDemand CAB?

Windows Server 2012 R2 has a “Features on Demand” model: the OS keeps feature payloads (like .NET 3.5) in a local store only if requested. If the payload is not available locally, the system attempts to download the required files from Windows Update.
In environments without internet access, you must provide the .NET 3.5 payload manually — either by pointing the installer to Windows Server installation media (sources\SxS) or by supplying the Microsoft-Windows-NetFx3-OnDemand-Package.cab extracted from media or downloaded from Microsoft.

Technical Write-Up: Installing .NET Framework 3.5 on Windows Server 2012 R2 via CAB File

Method C: Using WSUS (If applicable)

If the server is managed by WSUS, ensure the "Windows Server 2012 R2" updates are synchronized and the "Features on Demand" category is enabled in the WSUS console options.

The Complete Guide to Downloading and Installing the Microsoft-Windows-NetFx3-OnDemand-Package.cab on Windows Server 2012 R2

5. Common Issues & Troubleshooting

| Error | Cause | Solution | |-------|-------|----------| | 0x800f081f | Source files not found | Ensure CAB path is correct. Use DISM /Get-Packages to check if already partially installed. | | 0x800f0906 | Cannot download from Windows Update | Use DISM with /LimitAccess and /Source explicitly. | | 0x800f0922 | Disk space or corrupted image | Run DISM /RestoreHealth first, then retry. | | DISM fails with 0x800f0950 | Wrong CAB architecture (32-bit on 64-bit OS) | Verify you have the amd64 version of the CAB for Server 2012 R2 x64. |