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Unable to enable .Net Framework 3.5 in Windows Server R2 Update – CRM 2013 installation blocker

As part of installing CRM 2013 for one of our clients we have faced an issue where we couldn’t enable .Net Framework 3.5 in windows server 2012 R2. Here is why and what did we do to fix it.

possible reasons:

  1. Windows Server R2 Update might have the security update 2966827 or 2966828 already installed in the server and this would block enabling .Net Framework 3.5.
  2. Internet connection in server is not working

In case of reason#1 – you may uninstall security update  2966827 or 2966828 and try to enable .Net 3.5


In case of reason#2 – you can select the alternate source path which has the windows server R2 source files to install .Net Framework 3.5

Steps to follow:

Step 1. Select  ‘ Specify alternate source path’ while adding .Net 3.5 feature

Add Roles And Features-Net3_5

Step #2: provide path to the source folder [usually <Image drive>:\Sources\SxS ] and continue with the feature enabling. This should work.

Add Roles And Features-Net3_5_2




Unable to load the windows server 2012 R2 ISO file in virtual box. Getting error VERR_NOT_SUPPORTED

Recently my friend was trying to set up an environment in virtual box with the iso file for Windows Server 2012 R2. He was getting the  below error and has asked my help. I would like to share the reason for this issue in our case with you. If you come across a similar error it would be helpful and would save your time digging for more information on the web.


Error Message while mounting the iso file:

Could not get the storage format of the medium ‘C:\SharedFolder_VM\windows_server_2012_r2_x64_dvd_2707946 – Copy.iso’ (VERR_NOT_SUPPORTED).

VirtualBox Error

The issue here was mainly with the ISO file (an incomplete one). ISO file size was not as mentioned in the Microsoft site and believe something went wrong while downloading the file and it got messed up.


What we did to resolve this error: Re downloaded the ISO file from Microsoft site and it worked 🙂