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Installing .NET 3.5 Framework on Microsoft Windows Server 2012

Summary: Dell OS and Applications Solutions on Dell TechCenter - Project Sputnik, Microsoft Windows, Red Hat Linux, SUSE, Ubuntu, and more

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Symptoms

This blog post was originally written by Michael Schroeder.

Comments are welcome! To suggest a blog topic or make other comments, contact
WinServerBlogs@dell.com.

Today, there are a lot of applications and utilities available that leverage the .NET 3.5 framework to function properly. With Windows Server 2012, Microsoft provides both the .NET 3.5 and 4.5 install options for any of your applications’ requirements. When installing the .NET 3.5 components, you must pay careful attention to a few details.   

When using Server Manager to install the .NET 3.5 feature you may run into the following message indicating the source files could not found:

SLN310559_en_US__1i_net1_server2012_cr_v1
Figure 1: Server Manager to install the .NET 3.5

Using PowerShell to install, we see a similar message stating "The source files could not be downloaded" along with the error 0x800f0906. In my case, the server is not connected to the internet to access the Windows Update servers.

SLN310559_en_US__2i_net2_server2012_cr_v1
Figure 2: PowerShell to install message

Going back and looking more closely at the Add Roles and Features wizard, you’ll see a warning at the top asking the following and also providing a "Specify an alternate source path" link at the bottom of the wizard.

SLN310559_en_US__3i_net3_server2012_cr_v1
Figure 3: Specify an alternate source path

Why do we need to provide source files for this feature and not others? After running the following PowerShell command on a Full GUI install, we see the install state is set to "Removed" for these components. The "Removed" install state indicates that the feature files are not available on the local server. This is the default for all editions of Windows Server 2012.

SLN310559_en_US__4i_net4_server2012_cr_v1
Figure 4: PowerShell command on a Full GUI

For those servers without a WSUS server present or a connection to Windows Update, where the necessary components can be retrieved, we’ll need to provide an alternate source path to the side-by-side store (sxs) on the Windows Server installation media to complete the feature installation.

We can choose one of the following installation methods:

1. Using the Add Roles and Features Wizard, specify an alternate source path using the link at the bottom of the wizard. For example, D: is my Windows Server DVD media.

D:\Sources\sxs
2. Using PowerShell, specify the source files path when installing. 
Install-WindowsFeature NET-Framework-Core –Source D:\Sources\sxs

3. Using DISM from the command prompt, specify the source files path parameter:
 
DISM /Online /Enable-Feature /FeatureName:NetFx3 /Source:d:\sources\sxs

4. Using a file share containing the sxs folder, specify the unc share path:
 
Install-WindowsFeature NET-Framework-Core –Source \\ServerName\ShareName\sxs
 

Additional Resources:

TechNet: Install or Uninstall Roles, Role Services, or Features


Article Properties
Article Number: 000147619
Article Type: Solution
Last Modified: 21 Feb 2021
Version:  4
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