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Attempting to install the .NET 3.5 feature on a clean (domain joined) Server 2012 R2 Std VM (with internet access) failed as the wizard couldn’t find the source. I suspect that the server was looking to WSUS for the files rather than actually going out to Windows Update as the help suggested it should.
Some rather convoluted fixes were suggested by Microsoft in TechNet articles, but the solution I used was to simply mount the Server2012 ISO file within the VM, locate the Sources\SxS directory, and give the wizard this path as the ‘alternate source’. Didn’t even need a reboot!
Some rather convoluted fixes were suggested by Microsoft in TechNet articles, but the solution I used was to simply mount the Server2012 ISO file within the VM, locate the Sources\SxS directory, and give the wizard this path as the ‘alternate source’. Didn’t even need a reboot!
[EDIT – 09/02/16] – The same issue has been seen on Win 8/10 but the solution is a little different (albeit the above may work, an alternate method without the need for disks etc is available).
If you are doing this on a physical server and have the OS DVD to hand you can simply point it directly at that…
[EDIT – 23/05/16] If, as I’ve just encountered, you don’t get the option to select an alternate source, then you can run the following command from an elevated command prompt:
Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess
Replace the drive letter with that of your drive/mount point of course.
