When your server lacks internet access or cannot connect to Windows Update, the installation fails. To resolve this, you need the specific cabinet file: . Understanding the NetFX3 Architecture on Server 2012 R2
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. When your server lacks internet access or cannot
| Error Code | Typical Cause | How to Fix | | :--- | :--- | :--- | | | The installer cannot find the source files. | Double-check the source path in your command or GUI. Ensure the .cab file is present. This is the most common error. | | 0x800f0906 | The computer cannot download files from Windows Update, often due to network, proxy, or WSUS policies. | Use the /LimitAccess parameter with DISM or the -Source parameter in PowerShell to force it to use your local source and bypass Windows Update. | | 0x80070005 | An "access denied" error, indicating a permissions issue. | Ensure you are running Command Prompt or PowerShell as an administrator. | | Version Mismatch | The build number of your installed OS is newer than the ISO from which you extracted the .cab file. | You must obtain a newer ISO that matches your server's update level, or install .NET 3.5 before applying major updates like KB2919355. | | Error Code | Typical Cause | How
Open the setting: . Select Enabled .
[Date] Environment: Windows Server 2012 R2 (Standard/Datacenter) x64 This is the most common error
dism /Online /Add-Package /PackagePath:C:\Temp\NetFX3\Microsoft-Windows-NetFx3-OnDemand-Package.cab