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[转]如何在Windows Server 2012中安装.Net Framework 3.5?
阿齐 · 2012-12-26 · via 博客园 - 阿齐

出自:http://scorpiotek.com/blog/?p=1143

Installing .Net Framework 3.5 Features on Windows Server 2012

Remember the good ol days when installing .Net Framework Features on Windows Server 2008 R2 just required ticking off a checkbox when adding features?  I miss those days.

Server 2012 has made the process a bit more…elaborate, so to speak.  The 3.5 Framework Features are no part of what is called Features on Demand, you can read more about it here.  When you use Server Manager and select the Framework 3.5, you’ll now see this dialog with some extra options below, which if you are anything like me, will ignore completely and just click Next Next Next:

Do you need to specify an alternate source path? One or more installation selections are missing source files on the destination server. The server will try to get missing source files from Windows Update, or from a location that is specified by Group Policy. You can also click the “Specify an alternate source path” link on this page to provide a valid location for the source files.

After you click next, you will be greeted with this message:

Installation of one or more roles, role setvices, or features failed.  The source files could not be found.

Restart the wizard, but this time around click on that link to “Specify an alternate source path”:

NewImage

Now, you MUST insert the DVD of Server 2012 or mount an ISO and point to the following path (assuming your Windows Server 2012 mounted media is in D:\)

Specifu Alternate Source Path

The install will now finish successfully.   If you point to the sources\sxs\ directory via a UNC path, it will fail (at least it failed on me).