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Server 2012 R2:  .NET framework does not work

Posted on 2016-09-06
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Hi,

I am facing issues with .NET framework 2 or possibly 3.5
A production RDP server showed THOUSANDS of app crashes after the installation of a static database (phonebook-style) on friday.  Administration tools such as PowerShell, Server Manager or certain Snap-Ins for MMC cannot be started.  The machine boots just fine and runs applications such as Office or browsers without complaint.  Eventlog cannot be opened.

Support of the presumably offending applications shrugs off all help.  No issues are known.  Support of Datev, a popular and complex German bookkeeping software suite sais only that .NET framework seems to be damaged, which I already knew.  

I am finding many tools to download, install and repair .NET framework, but none of them seem to apply to Server 2012 R2, where .NET framework is a feature of the OS and is not installed from downloads.

Is there anything I can do other than reinstall?  No backup, unfortunately.

Thanks,
Ralph
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Question by:Ralph Scharping
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it_saige earned 500 total points
ID: 41786608
Server 2012 R2 has both .NET 3.5 and .NET 4.5.1 as features of the operating system.  Reinstalling .NET 3.5 is fairly straightforward:

http://www.danielclasson.com/install-net-framework-35-server-2012/
http://blog.dbi-services.com/winows-server-2012-r2-failed-to-install-net-framework-35/

.NET 4.5.1, on the other hand, presents a problem when trying to reinstall as the Windows Graphical Interface is directly depended upon it.  So if you need to reinstall .NET 4.5 you will need to use the following instructions in order to reinstall the .NET 4.5.1 framework:

https://blogs.technet.microsoft.com/askcore/2014/04/24/removing-net-framework-4-54-5-1-removes-windows-20122012r2-ui-and-other-features/

-saige-
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by:Ralph Scharping
ID: 41786779
Well... as I said above, I cannot open the server manager...
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by:it_saige
ID: 41786984
The first link provides a command line method to install the .NET 3.5 framework as does this technet article:

https://technet.microsoft.com/en-us/library/dn482069.aspx

Most links found provide both a command line method as well as the gui method because not all instances of Server 2012 are running the GUI, take server core for instance.

-saige-
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by:Ralph Scharping
ID: 41787336
The command-line tool seems to use the same things "under the hood" that are failing in the GUI.  Anyway - I got nowhere and reinstalled the machine.
Thanks anyway.
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