Access to the Windows Server 2012 R2 installation ISO or DVD. Method 1: Using the ISO/DVD (Recommended) This is the most reliable method.
Once the DISM command reaches 100%, you should receive a "successful" message. You can verify the installation in Server Manager under . powershell
This is the user-friendly approach if you have a graphical interface. Access to the Windows Server 2012 R2 installation ISO or DVD
/LimitAccess : Prevents DISM from trying to contact Windows Update.
: Insert or mount your Windows Server 2012 R2 ISO. You can verify the installation in Server Manager under
The most reliable, modern solution is the . This file (often referred to as the "Features on Demand" package) allows system administrators to install .NET 3.5 without needing the original Windows Server 2012 R2 ISO mounted locally, without Windows Update, and without an active internet connection on the server itself.
PowerShell provides a more modern command-line alternative. : Insert or mount your Windows Server 2012 R2 ISO
If your server is connected to WSUS, it may fail to find the package. You may need to bypass WSUS by adding /LimitAccess to your DISM command or adjusting the Group Policy
: Reboot the server, temporarily disable strict Group Policies regulating Windows Update, and run the DISM command again. To help you get this resolved quickly, let me know:
This article provides a comprehensive guide on how to acquire, use, and troubleshoot the microsoft-windows-netfx3-ondemand-package.cab file to enable .NET Framework 3.5. Why You Need the .CAB File
Install-WindowsFeature Name Net-Framework-Core -Source "D:\sources\sxs" Use code with caution. Troubleshooting Common Installation Errors Error Code 0x800F0906 or 0x800F081F