TFTP Open Timeout – PXE Boot | SCCM 2012 R2

Recently I was setting up PXE booting with SCCM 2012 R2 (new setup).  When starting the client workstation up and pressing F12 to network boot, I got the following error:

Having a look online to find out what this issue was, I struggled to find the exact cause of my particular issue.  There were many blogs and posts about this issue, but nothing referred to a solution which would have helped me.

It turns out that this is a bug with Microsoft and there is a Hot Fix available to download.  The Hot Fix is available here.

After installing this Hot Fix, I rebooted the SCCM server, then attempted to boot to PXE again on the client workstation.  This time it worked perfectly!