“You cannot import this boot image. Only finalized boot images are supported” ConfigMgr 2012 R2


You get the following error when adding a boot image to SCCM 2012 R2

“You cannot import this boot image.  Only finalized boot images are supported.”


Check if you have McAfee VirusScan Enterprise installed on your SCCM server.

If yes, make sure you have these exclusions configured.  In my case, I also had to temporarily un-install McAfee VirusScan.


The Curious case of OSD via SCCM ConfigMgr causing a network outage

Recently I deployed SCCM 2012 R2 for a customer mainly for the purpose of deploying desktop operating systems over the network.


A site server with a local SQL was deployed in the customer’s datacentre with the management point and distribution point role.  A distribution point server was deployed in the customers head office to services content (images) to pc’s on the local area network.



However, shortly into the testing phase of the OSD process, it was reported that network services were being disrupted on the LAN (e.g. access to LOB applications, file servers etc)…..and across the WAN!!  This was happening when deploying the image to less than 5 PC’s simultaneously.  The DP server in the head office and the PC’s being images (new PC’s) were all connected directly to the same switch.  The image was approx. 8GB in size.

There were lots of questions asked e.g.

  • How is SCCM deploying images?
  • Unicast or multicast enabled?
  • Is the content being deployed over the WAN?
  • How big is the image?

In a nutshell…What mis-configuration within SCCM is causing this issue??

I didn’t believe SCCM was causing the issue.  But how did I go about proving it?

Troubleshooting Approach

I hate getting caught up in network related issues cause I’m not a network guy.  So my approach to dealing with this was to isolate the issue and determine if indeed SCCM was the cause, or if it was simply the trigger.  So how did I do this….

  1. I deployed MDT on the distribution point server in the head office.
  2. I got the network team to set up the relevant network captures
  3. I then recreated the deployment scenario by deploying the same image via MDT as I used in SCCM to the same group of PC’s


Why did I do this?

  • If the same issue was occurring when deploying images via MDT, then it wasn’t a configuration issue within SCCM causing the problem.
  • Then hopefully, with the right network capture, the network team can identify what issue on the network is causing the problem


The result of the test was that the same network outage symptoms occurred when deploying images over the network via MDT.  Therefore, it was not a configuration issue within SCCM 🙂

In terms of what is causing the issue, there are some theories emerging from the network team (misconfigured default gateways / DHCP / switches), but it’s still under investigation.  I’ll post an update when I hear back.  But for now, SCCM (and me) are in the clear! 🙂 🙂


Build & Capture a Windows 8.1 reference image using MDT 2013

I was about the write a blog post summarizing the steps the build & capture a Windows 8.1 reference image using MDT 2013.

However, I stumbled upon a great post from Gerry Hampson doing just that (well..with Windows 7):

Create customised reference image with MDT 2013 Lite Touch Build & Capture – 5 easy steps

In this blog, Gerry summarizes the steps for Windows 7, and includes links to a detailed step by step from Mitch Tullock found here and a blog from Johan Arwidmark on the right way to build and capture (link)

So in summary, to paraphrase Gerry Hampson

  1. In the MDT Deployment Workbench, create a deployment share
  2. Populate the deployment share with the Windows 8.1 source media
  3. Create task sequence to deploy Windows 8.1 to the reference computer
    1. Add a task to pause the sequence between build and capture.  This is where you can install applications, make registry changes etc.
  4. Don’t forget to Update the deployment share
  5. Import the Lite Touch Windows PE x64 image from the boot folder in the deployment share into “boot images” in WDS
  6. PXE boot the reference computer
  7. Select the task sequence you just created and follow the instructions to deploy and capture the Windows 8.1 image

The above assumes you have MDT & WDS already installed.

Finally, John Baker has a very good video here demonstrating these steps