Unable to install .net 3.5 on Windows server 2012

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http://serverfault.com – I am trying to install .Net 3.5 on Windows server 2012 and it constantly keeps failing. I am using "Add or remove features" and my internet is already there. I've read that if alternate source couldn't be found, the installer tries to download online and installs it from there. However, it's not working. This is the screenshot that I keep seeing: Please suggest what am I missing? Edit: I already tried using: dism.exe /online /enable-feature /featurename:NetFX3 /Source:D:\sources\sxs /all but I do not have the source disk with me. I want to download it online. (HowTos)