<div>
Hi frankbustos,<br />
<br />
Windows Server 2012 includes .NET Framework 4.5 by default, as well as optional installation of the .NET 3.5 Framework. Developers frequently need to run mixed web applications across multiple .NET Framework versions. Please check the below link which describe the details step by step process.<br />
<br />
IIS 8.0 Using ASP.NET 3.5 and ASP.NET 4.5:<br />
<br />
<b><a href="https://www.iis.net/learn/get-started/whats-new-in-iis-8/iis-80-using-aspnet-35-and-aspnet-45" rel="ugc">https://www.iis.net/learn/get-started/whats-new-in-iis-8/iis-80-using-aspnet-35-and-aspnet-45</a></b><br />
<br />
Regards,<br />
Tapan Pattanaik
</div>


Hi frankbustos,

Windows Server 2012 includes .NET Framework 4.5 by default, as well as optional installation of the .NET 3.5 Framework. Developers frequently need to run mixed web applications across multiple .NET Framework versions. Please check the below link which describe the details step by step process.

IIS 8.0 Using ASP.NET 3.5 and ASP.NET 4.5:

https://www.iis.net/learn/get-started/whats-new-in-iis-8/iis-80-using-aspnet-35-and-aspnet-45 [https://www.iis.net/learn/get-started/whats-new-in-iis-8/iis-80-using-aspnet-35-and-aspnet-45]

Regards,
Tapan Pattanaik

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Did you check the Event Viewer for any clues on why it stopped? That's usually the first place to look ...
</div>


Did you check the Event Viewer for any clues on why it stopped? That's usually the first place to look ...

<div>
Run<br />

<pre><code id="code-20-41982760-1">DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs</code></pre>
where d: is your Windows installation disk
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Run


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

where d: is your Windows installation disk

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<div class="content wysiwyg-content">
Hi experts,<br />
<br />
&nbsp;I have a server 2012 standard and I went to add roles and features to add .NET Framework and it starts the installation process and then 1/2 ways it fails.<br />
<br />
Installation of one or more roles, role services , or feature failed. The source could not be found. <br />
NET Framework 3.5 features
</div>
</div>


Hi experts,

 I have a server 2012 standard and I went to add roles and features to add .NET Framework and it starts the installation process and then 1/2 ways it fails.

Installation of one or more roles, role services , or feature failed. The source could not be found. 
NET Framework 3.5 features

Unable to install .NET Framework 4.5 features

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

.NET application servers, a Windows Server role in an application role, includes Internet Information Services (IIS) to provide web server support, the .NET Framework to provide application support, ASP.NET to provide server side scripting, COM+ for application component communication, Message Queuing for multithreaded processing, and the Windows Communication Foundation (WCF) for application communication. There are also third party server systems that provide .NET support, including Mono, Base4, TNAPS and cc Devnet Data Access Server.