Why dotnet framework 3.5 setup failed?

This is using MS Windows 2012 r2 server. Dot net framework 4.0 is setup by the developer. However, they also demand dot net framework 3.5 to be install. So, I went to the server manager > roles and features, and then follow the wizard with attempt to get it installed. The setup failed even I select to point the source to the w2k12 r2 cd, why?

Thanks in advance.
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MichaelBalackAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
go to programs and features -> show installed updates
see if KB2966826, KB2966827, KB2966828 are installed
if they are, uninstall and try .net framwork install again
it is known to prevent .net 3.5 from being installed
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MichaelBalackAuthor Commented:
Hi Seth,

Just checked, the above 3 updates not installed.
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ChrisCommented:
Not sure why it failed but the way I had to get it installed on a Win8.1 Pro was to installed from the Install CD.

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs

Change the drive letter to match your CDROM

This should also work for Server 2012.
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MichaelBalackAuthor Commented:
Hi Chris,

Try the dism command, same result - failed at 65.9%
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MichaelBalackAuthor Commented:
Hi all,

I tried these:

      a. Copy the w2k12 r2 ISO to the server
      b. Unzip the above ISO
      c. Run the add roles and features > tick Dot net framework 3.5 (for 2.0 & 3.0)
      d. Select alternative share, and point it to the unzipped ISO folder
      e. Surprisingly, the installation proceed and completes
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SteveCommented:
its an odd issue with this version of server I think.

add the role/feature and look at the bottom of the wizard for an option something like 'specify alternative source'
enter <cdrom>:\sources\sxs (eg d:\sources\sxs) and give it a go. should work fine.
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MichaelBalackAuthor Commented:
It works
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Windows Server 2012

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