Unable install NetFX3 into Windows server 2012R2

Question

Hi,

I am start migration from W2012r2 to W2022 into customer. Unfortunatly I do not install NetFx3 into W2012R2 server.

I try GUI, Powershell and DISM.

When try install used DISM - my install finish error Error: 0x800f0906

C:\Windows\system32>dism /online /enable-feature /featurename:NetFX3 /all

Error:The source files could not be downloaded.

When used

C:\Windows\system32>dism /online /enable-feature /featurename:NetFX3 /all /Sourc

e:e:\sources\sxs /LimitAccess

Error: 0x800f081f

The source files could not be found.

I find another text about KB, when must uninstall:2966827,2966828,KB5027141, KB5028872, KB5028970, or KB5029915

I do not see instaled these KB in my systems.

I feel like it's closed for NetFX3 installation , like there's some patch that makes it impossible.

Does anyone have such information, do you know, can you help ?

Thank you

Best regards,

Radek Ryšan

Answer 1

Hello

Thank you for posting in Microsoft Community forum.

It sounds like you're attempting to install the .NET Framework 3.5 on Windows Server 2012 R2 and encountering an issue with the source files not being available. Here's some methods you can try:

First, ensure that your system is fully updated as updates might include necessary files.

1. Prepare the Source Files:

If you have the Windows Server 2012 R2 installation media, you can use it as the source for the .NET Framework 3.5 files.

Mount the ISO or insert the installation DVD.

2. Use DISM with a Source Path:

Note the drive letter of the mounted ISO or installation DVD (let's assume it's D:).

The required files are located in the sources\sxs folder. Using DISM, you can specify the source path as follows:

dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess

Note：Replace D: with the actual drive letter of your mounted ISO or installation media.

3. Ensure Connectivity to Windows Update (if using online source):

If you don't have the installation media, ensure that the server has access to Windows Update, as DISM might attempt to download the feature from there.

4. Check Group Policy Settings (if applicable):

Sometimes, group policies can restrict the installation. Ensure there is no policy blocking the installation of features from Windows Update.

Check the policies at Computer Configuration -> Administrative Templates -> System -> Specify settings for optional component installation and component repair. Ensure it is either "Not Configured" or configured to allow the installation of optional components.

5. Install via Server Manager:

Open Server Manager.

Navigate to Add roles and features.

Follow the wizard and select .NET Framework 3.5 Features.

On the "Confirm installation selections" page, click "Specify an alternate source path".

Enter the path to the sources\sxs folder on your installation media.

I hope the information above is helpful.

If you have any question or concern, please feel free to let us know.

Best Regards,

Daisy Zhou

Answer 2

Hello Daisy,

thank you for reply.

Your instructions are know for me and I am used this.

1. I am check GPO, but I don't configure "Specify settings for optional component installation and component repair"
2. I use source DVD W2012r2 for DISM - result false

3. Install form GUI - result false

Error:

I try install NetFx3 to another member server W2012r2 in same domain. Install finish same error.

I try install NetFx3 to another member server W2022 in same domain and succesfull. Server are in same AD container (member server), I so think, that the problem don't in GPO.

Some ideas ?

Thank you.

Best Regards,

Radek Ryšan

Answer 3

Hello

Greetings！

Please check if you can install it on one Windows server 2012 in the workgroup.

Best Regards,
Daisy Zhou

Answer 4

Same boat as you: Migrating old systems and need to bring up 2012R2 with SQL Server 2012 (failing with netfx3 error) in 2025. :-/

After full round of Windows Update (113 items?) this feature is failing, just like you are describing.

We probably scanned the same sources, but try to uninstall these manually by CMD?

wusa /uninstall /KB:5028970

wusa /uninstall /KB:5028872

wusa /uninstall /KB:5029915

My system didn't have the first two, but the last one did the trick over here!

Source:

https://www.sysnative.com/forums/threads/windows-server-2012r2-does-not-want-to-install-net-framework-3-5.39508/

Good luck!