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The release of ConfigMgr 2012 R2 caused some issues with Operating System Deployment when a PXE enabled Distribution Point was co-located with Site Servers.
1. WDS crashing
2. Very slow download speeds for OSD files
The official descriptions are as follows:
After you enable the PXE Service Point role on an instance of a specific distribution point, or you select the Deploy this boot image from the PXE-enabled distribution point property of a boot image, the Windows Deployment Service (WDS) stops running.
Note: This problem affects only distribution points that are installed on site servers.
When operating system image files are downloaded to Configuration Manager 2012 R2 clients, you may find that the download takes longer than it did in previous versions of Configuration Manager 2012 clients. You may see this behavior when the target client is running Windows PE or a full Windows operating system.
These issues were resolved with Hotfix KB2905002. The Hotfix can be downloaded here
You can also find installation information on this page.
Download and extract the Hotfix files.
Launch the executable.
See the "Welcome Screen". It gives information on how KB2905002 should be applied. Click Next.
Accept the License Terms and click Next.
The prerequisite check begins. See the Warning.
A pending restart has been detected. Close and restart the server.
After the restart the prerequisite check passes.
Choose to install the update for the console.
Choose all the options.
Enter your preferred names and source for the Server package.
Enter your preferred names and source for the Console package.
Enter your preferred names and source for the client package.
Review the summary and click to install.
Update installation has completed successfully. Review the log file and click Next.
Click Finish to close the wizard.
Now deploy the server, console and client packages. Create x86 and x64 collections to deploy the correct client package.
Don't forget you HAVE to update all boot images on your Distribution Points.