Windows Server 2019 Cannot Install .NET 3.5

[PaulRBoyer]

I am running Windows Server 2019 (Version 1809, Build 17763.4499) and I cannot install .NET Framework 3.5. Below is the current installation status of the feature on my machine:

PS > Get-WindowsFeature -Name  NET-Framework-Features,NET-Framework-Core,NET-HTTP-Activation,NET-Non-HTTP-Activ

Display Name                                            Name                       Install State
------------                                            ----                       -------------
[X] .NET Framework 3.5 Features                         NET-Framework-Features         Installed
    [ ] .NET Framework 3.5 (includes .NET 2.0 and 3.0)  NET-Framework-Core               Removed
    [ ] HTTP Activation                                 NET-HTTP-Activation              Removed
    [ ] Non-HTTP Activation                             NET-Non-HTTP-Activ               Removed

Through hours of searching online I have not been able to discover a resolution to the issue I am seeing. I followed the installation steps in How to Install .NET Framework 3.5 on Windows 11/10 and Windows Server (Windows OS Hub) as this was the most complete guide. None of the suggested installation methods worked.

1. Via Server Manager: Add roles and features -> Features -> .NET Framework 3.5 Features -> .NET Framework 3.5 (includes .NET 2.0 and 3.0 );
2. Using DISM:

   DISM /Online /Enable-Feature /FeatureName:NetFx3 /All

   1. Using DISM:

      DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess

3. With PowerShell:

   Install-WindowsFeature -Name NET-Framework-Core

   1. With PowerShell:

      Install-WindowsFeature -Name NET-Framework-Core -Source D:\Sources\SxS

4. With DISM:

   DISM /online /Add-Package /PackagePath:D:\Sources\SxS\microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab

I also tried using the offline packages from my installation media without success. And when trying to use GPO to force installation from / prohibit installation from Windows Update (non-WSUS) I did not see any results.

Regardless which method I use, I end up getting the same 0x800f0800 error. I've only come across one other user who has received the same error code when trying to install a Windows feature, but their resolution was just rebuilding their server. This is not a viable option for my scenario. The full error from PowerShell is displayed below:

PS> Install-WindowsFeature -Name NET-Framework-Core -Source D:\Sources\SxS

Install-WindowsFeature : The request to add or remove features on the specified server failed.
Installation of one or more roles, role services, or features failed. Error: 0x800f0800
At line:1 char:1
+ Install-WindowsFeature -Name NET-Framework-Core -Source D:\Sources\SxS
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (@{Vhd=; Credent...Name=localhost}:PSObject) [Install-WindowsFeature],
    Exception
    + FullyQualifiedErrorId : DISMAPI_Error__Failed_To_Enable_Updates,Microsoft.Windows.ServerManager.Commands.AddWind
   owsFeatureCommand

Any help on this issue is greatly appreciated!

Crosspost: powershell - Windows Server 2019 Cannot Install .NET 3.5 - Server Fault

[#2]

Temporary extract the offline cab file from installation media and add it as regular update (not FOD)

md %systemdrive%\tempnetfx3
expand.exe -f:* D:\Sources\SxS\microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab %systemdrive%\tempnetfx3 >nul

dism.exe /Online /Add-Package /PackagePath:"%systemdrive%\tempnetfx3\update.mum"

rd /s /q %systemdrive%\tempnetfx3

[#3]

@abbodi1406 I followed the commands you provided to extract the files from the CAB archive. Then I used DISM.exe to add the ".mum" file to the system.

What needs to be done next to finish installing .NET 3.5? I don't see it listed as "Installed" when I run

Get-WindowsFeature

.When I try to install it from the Server Manager GUI, I get the error:

The parameter is incorrect. Error: 0x80070057

[#4]

Well, what dism.exe command result? that usually should already enabled it

[#5]

@abbodi1406 Here is the result from running DISM to add the feature using the method you suggested.

dism /online /add-package /packagepath:C:\temp\netfx3\update.mum

Deployment Image Servicing and Management tool
Version: 10.0.17763.3406

Image Version: 10.0.17763.4499

Processing 1 of 1 - Adding package Microsoft-Windows-NetFx3-OnDemand-Package~31bf3856ad364e35~amd64~~10.0.17763.1
[==========================100.0%==========================]
The operation completed successfully.

Yet, when I check my installed/enabled Windows Features

get-windowsfeature -name net-framework-features,net-framework-core,net-http-activation,net-non-http-activ

Display Name                                            Name                       Install State
------------                                            ----                       -------------
[X] .NET Framework 3.5 Features                         NET-Framework-Features         Installed
    [ ] .NET Framework 3.5 (includes .NET 2.0 and 3.0)  NET-Framework-Core               Removed
    [ ] HTTP Activation                                 NET-HTTP-Activation              Removed
    [ ] Non-HTTP Activation                             NET-Non-HTTP-Activ               Removed

[#6]

Hi, I have exactly the same situation so I'm interested: Has someone found a solution?

Well, I just followed the steps as described by @abbodi1406 on ‎Jun 21 2023 02:21 PM and for me this works great, after the last step I get this :

get-windowsfeature -name net-framework-features,net-framework-core,net-http-activation,net-non-http-activ

Display Name                                            Name                       Install State
------------                                            ----                       -------------
[X] .NET Framework 3.5 Features                         NET-Framework-Features         Installed
    [X] .NET Framework 3.5 (includes .NET 2.0 and 3.0)  NET-Framework-Core             Installed
    [ ] HTTP Activation                                 NET-HTTP-Activation            Available
    [ ] Non-HTTP Activation                             NET-Non-HTTP-Activ             Available