The source files could not be found. Try installing the roles, roles services, or features again in a new Add Roles and Features Wizard session, and on the Confirmation page of the wizard, click "Specify an alternate source path" to specify a valid location of source files that are required for the installation. The location must be accessible by the computer account of the destination server.
Then I tried to follow instructions from that message. I specified the path to the Windows image. In my case: F:\sources\sxs. But this surprisingly ended again with same message!
Another approach: Try to install it from command line using DISM (Deployment Image Servicing and Management) with this command:
Dism /online /enable-feature /featurename:NetFx3 /All
and this one to specify the the source files:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:F:\sources\sxs /LimitAccess
Both of them ended up again with same error like in previous cases using wizard:
only difference in errorcodes:
Without source files specified: Error: 0x800f0906
With source files specified: Error: 0x800f081f
The source files could not be downloaded.
Use the "source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.
The DISM log file can be found at C:\Windows\Logs\DISM\dism.log
Analyzing DISM log file doesn't bring any news.
Then I followed this article from Microsoft, which can somebody help, but me not: http://support.microsoft.com/kb/2734782/en-us
All these I tried under domain administrator account and under local administrator too. All the time same response.
Working solution for me:
1. Take out server from domain
2. Login with local administrator and Enable .NET feature
3. Re-Join server in to domain
I hope that can help someone.