winserver2016服务器，开启IIS功能，提示备用源找不到

打开PowerShell，执行以下命令

1. Set-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU' -Name UseWUServer -Value 0

2. Restart-Service -Name wuauserv

3. Install-WindowsFeature Net-Framework-Core

4. Set-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU' -Name UseWUServer -Value 1

5. Restart-Service -Name wuauserv