Microsoftwindowsnetfx3ondemandpackagecab Download Server 2012 R2 New Hot! Review

Report: Analysis of "microsoftwindowsnetfx3ondemandpackagecab" for Windows Server 2012 R2

Executive Summary This report analyzes the search query regarding the download of the microsoft-windows-netfx3-ondemand-package.cab file specifically for Windows Server 2012 R2.

The analysis concludes that downloading this specific .cab file from third-party sources is unnecessary and highly discouraged. Windows Server 2012 R2 includes the .NET Framework 3.5 binary files locally on the installation media. The issue is rarely a missing file, but rather a misconfiguration of the installation source (SxS folder) or a lack of internet access for Windows Update fallback.

6. Best Practices

• ✅ Always scan the CAB file with antivirus before use.
• ✅ Keep a copy of the CAB in a network share for multiple servers.
• ✅ Document the installation in change management logs.
• ❌ Do not manually extract the CAB and copy individual DLLs.
• ❌ Avoid using outdated CABs from Server 2012 (non-R2) – not compatible.

Method A: Using the Installation Media (Recommended)

This is the "offline" method and does not require an internet connection. ✅ Always scan the CAB file with antivirus before use

1. Mount the Windows Server 2012 R2 ISO or insert the DVD.
2. Open Command Prompt (Run as Administrator).
3. Run the following DISM command (assuming the DVD drive is letter D:):

   DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs
   

   Note: The microsoft-windows-netfx3-ondemand-package.cab is located inside the sources\sxs folder on the DVD.

Troubleshooting Common Errors

Even with a new CAB, you might see errors. Here’s how to fix them.

| Error Code | Meaning | Solution | |------------|---------|----------| | 0x800f081f | Source files not found | Ensure the folder path is correct and the CAB is not nested in subfolders. Use dir C:\Temp\NetFX3\*.cab to confirm. | | 0x800f0906 | Cannot download from Windows Update | Add /LimitAccess to your DISM command to force it to use only the local CAB. | | 0x800f0922 | Feature installation failed after reboot | Check Group Policy: Computer Config → Admin Templates → System → "Specify settings for optional component installation". Set to "Enabled" with alternate source. | | 0x80070005 | Access denied | Re-run PowerShell/CMD as Administrator. | | 0x800f0831 | CBS corruption | Run sfc /scannow and dism /online /cleanup-image /restorehealth first. |

Option 2: Microsoft Evaluation Center (for testing/new downloads)

• Download the official Windows Server 2012 R2 Evaluation ISO from Microsoft’s website.
• Mount the ISO and extract the Microsoft-Windows-NetFx3-OnDemand-Package.cab from the \sources\sxs\ folder.

Enabling .NET Framework 3.5 (Microsoft-Windows-NetFx3-OnDemand-Package.cab) on Windows Server 2012 R2

Windows Server 2012 R2 does not include .NET Framework 3.5 full installation files by default. When you install or enable the .NET Framework 3.5 (which includes .NET 2.0 and 3.0), Windows tries to retrieve required files from Windows Update or from local installation media. The package commonly referenced for offline installations is named Microsoft-Windows-NetFx3-OnDemand-Package.cab. This article explains what that CAB is, why you might need it, and how to install .NET Framework 3.5 on Server 2012 R2 from local sources or a network share (without requiring direct internet access). bypassing Windows Update.

Best Practices for Server 2012 R2 Administrators

1. Keep the CAB in a network share – Instead of storing it on each server, place it on a read-only share (e.g., \\fileserver\sxs\). Reference it via UNC path in DISM: /Source:\\fileserver\sxs.
2. Integrate into your gold image – Use DISM to inject the CAB into your base WIM file for future deployments:
   dism /mount-wim /wimfile:install.wim /index:1 /mountdir:c:\mount
dism /image:c:\mount /add-package /packagepath:Microsoft-Windows-NetFx3-OnDemand-Package.cab
dism /unmount-wim /mountdir:c:\mount /commit
3. Plan for end-of-life – Windows Server 2012 R2 reached end of extended support in October 2023. Microsoft no longer provides new CAB signatures. If you need a "new" clean copy, download an ISO from the Volume Licensing portal before it is removed.

Method 1: The Recommended Way (Using the ISO/Source Files)

You do not strictly need to download a .cab file manually. The easiest way is to point the server to the source files inside the ISO.

1. Mount the ISO:

   • Locate your Windows_Server_2012_R2.iso file.
   • Right-click it and select Mount. Note the drive letter assigned (e.g., D:).

2. Open Server Manager:

   • Open Server Manager.
   • Click Manage > Add Roles and Features.

3. Navigate the Wizard:

   • Click Next until you reach the Features tab.
   • Check the box for .NET Framework 3.5 Features.
   • Click Next.

4. Specify an Alternate Source Path (Crucial Step):

   • On the "Confirm installation options" screen, look for the link at the bottom that says "Specify an alternate source path".
   • In the path field, type the location of the SxS folder on your mounted ISO.
   • Path: D:\sources\sxs (Replace D: with your actual drive letter).
   • Click OK and then Install.

This will install the feature directly using the files contained in the ISO, bypassing Windows Update. On the "Confirm installation options" screen

The .cab Installation "Succeeds" but .NET 3.5 Still Shows as Not Installed

Solution: Some applications check for specific sub-features. Run the following to enable all subcomponents:

dism /online /enable-feature /featurename:NetFx3ServerFeatures /all
dism /online /enable-feature /featurename:NetFx3WCF /all