Unlike modern runtime versions, Windows Server 2012 R2 does not include the .NET 3.5 payload in its active side-by-side ( WinSxS ) staging directory to reduce the OS footprint. Instead, the system must pull these files dynamically. When a server lacks a direct internet connection, operates behind an unconfigured Windows Server Update Services (WSUS) architecture, or runs into specific security update conflicts, the installation fails with notorious errors like , 0x800F081F , or 0x800F0907 .
Once the DISM command reaches 100%, you should receive a "successful" message. You can verify the installation in Server Manager under . powershell Unlike modern runtime versions, Windows Server 2012 R2
Installing .NET Framework 3.5 on Windows Server 2012 R2 Installing .NET Framework 3.5 on Windows Server 2012 R2 is a common requirement for running legacy applications, but it often encounters errors like or 0x800F081F because the necessary source files are not included in the default installation image to save space. Once the DISM command reaches 100%, you should
If PowerShell is unavailable, use the Deployment Image Servicing and Management (DISM) tool: If PowerShell is unavailable, use the Deployment Image
Check .