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.
However, in disconnected environments, air-gapped networks, or when update servers are unavailable, the system fails to install NetFX3 via the "Add Roles and Features Wizard" (stalling at 70% or failing with error 0x800f0906 or 0x800f081f). The solution is to provide the .cab file directly. This guide addresses how to obtain and install the
Installing .NET Framework 3.5 on Windows Server 2012 R2 often requires the microsoft-windows-netfx3-ondemand-package.cab file, as the source files are not installed by default to save disk space. This guide explains how to acquire the necessary files and resolve common installation errors using the Microsoft Evaluation Center and standard administrative tools. Windows Server 2012 R2 has a “Features on