Today, a customer's own computer to install a windows server 2016 would like to install a IIS, a program written in C + ERP, NET is inevitable, NET4.7 can be installed, but is 3.5, how also not installed, an error (status: 0x800f0950 ), see particularly FIG;
Error Error description and is as follows:
When you add roles and features, check the IIS and .NET Framewok 3.5, suggesting the installation failed, error: 0x800f0950 in the "Event Viewer" in the "Start Package Microsoft .NET Framework 3.0 update NetFx3 failed state:. 0x800f0950"
Nazan another way, when you download the offline installation can not it? Specific look:
Error persists, this embarrassment, this belongs to what problem? According to the online operation then toss in a circle; some let off the firewall, and some allow to download the offline installation package, and some allow loading new IOS, is a variety of methods to no avail;
problem causes:
windows automatically updated to disable the cause can not be added .net application;
There are two solutions specifically, there are two gods assists, a total of four ways, please refer to yourself:
The first solution:
1, a manual update via Windows Update, will be automatically marked with .NET Framework-related patch; or you can also turn on automatic updates;
2. Add Roles and Features again
Add Roles and Features again
3, the installation was successful NET3.5
4, view the IIS already has;
The second way:
1, first download the offline installation package net 3.5, in the Microsoft the .NET Framework 3.5 Service Pack 1 (full package) (point I can directly download - Official Download oh)
2、将下载的dotnetfx35.exe 文件放到 此电脑–系统盘（基本都为C盘）–windows–system32 文件夹中
以上方式还没有能解决你的问题，那我们就来看看第三种方式；
第三种方法：
1. 通过DVD或者USB设备挂载ISO到机器上。
2. 使用管理员用户权限打开命令提示符，输入以下命令：
Dism /online /enable-feature /featurename:NetFX3 /All /Source:E:\sources\sxs /LimitAccess
注意：参数中是要从位于E：驱动器上的安装介质安装.NET Framework 3.5，您需要按照实际ISO挂载的盘符修改参数。
windows 10 Windows 2019 不能用的话用原光盘加载虚拟光驱；
1、首先在Win10 ISO文件上点击右键，选择“装载” “这台电脑”中就会显示虚拟光驱“DVD驱动器(E:)”，记下盘符“E:”。
2、然后以管理员身份运行命令提示符 （或者右键点击Win10开始按钮，以管理员身份运行Windows PowerShell），在“管理员:命令提示符（或管理员: Windows PowerShell）”窗口中输入以下命令： dism.exe /online /enable-feature /featurename:netfx3 /Source:E:\sources\sxs
注意：参数中是要从位于E：驱动器上的安装介质安装.NET Framework 3.5；
| Can also be used in this way Ha 1. Open your version of the iso, sources \ There are four cab file sxs \ under 2. Open Dism ++, update management - Add (above 4 cab file) 3. then open the Control Panel - Programs and function - to enable or disable windows function --- Net 3.5 check box on the hook |
Also a magic thing is not verified, it said to be feasible;
The fourth method:
1, press Win + X (right or lower left corner of the Start menu) - Programs and Features - Enable or disable the function of the left
2, .net 4.6 to remove the check point is determined, waiting for completion
3. Repeat step 1, check .net 3.5, determined point, waiting for completion;
4. Repeat steps 1, check .net 4.6, determined point, waiting for completion;
Above, is about Win10, Win2016, Win2019, NET3.5 can not be installed on a Windows system, and the error code is: solutions 0x800f0950, as you also have this problem, it can be resolved in accordance with the above, and I hope you can successfully Benpian Oh to help you solve the problem, you need additional assistance, please continue to search this site to see. Please also be able to support a lot of old beams of the blog. It can also be a reward bloggers oh;