NET 3.5 on Windows Server using the Server Manager console (Add Roles and Features -> Features -> NET Framework 3.5 Features), the installation fails with the error 0x800f081f ( The source files could not be found) or 0x800F0950.Īlthough.

If there is no direct Internet access from the server, then when you trying to install. Proxy and firewall settings should not restrict access to Windows Update servers.Your server is not configured to receive updates from the local WSUS server (check the update settings in GPO or directly in the servers’ registry).For this installation method to work, you need to make sure: NET 3.5 distribution files for your Windows Server version are downloaded from the Windows Update servers. Using PowerShell: Install-WindowsFeature NET-Framework-Core.Using DISM command: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All.If your Windows Server has direct Internet access, you can install. Managing Optional Component Installation with GPO.NET Framework 3.5 using DISM or PowerShell?