Installing .Net Framework 3.5 Feature on Windows Server 2012

When trying to install certain roles on Windows Server 2012 you may need to add the .Net framework 3.5 feature. If you're trying to do this from within the GUI then it will most likely error as the 3.5 framework is now part of what Microsoft are calling Features on Demand.

To remedy this either open an elevated prompt and key the command below assuming the source media is in drive D:

dism /online /enable-feature /featurename:NetFX3 /all /Source:d:\sources\sxs /LimitAccess

Alternatively follow the procedure below to speficy an alternate source path.

1. Insert Windows Server 2012 DVD or iso to D drive.
2. Open Add Roles and Features Wizard.
4. Select Specify an alternate source path link in the Confirm installation selections screen.
5. Path: D:\Sources\SxS and then click OK.
6. Finally click Install button.

You can now proceed with adding your core role.