After applying KB971413 to fix Multicasting for SCCM 2007 OSD deployments where the Windows OS WIM file is over 4GB, Multicast OS deployments may no longer work, including for Windows OS WIM files that are under 4GB. If enabled, the deployment falls back to Unicast and completes successfully.
The most likely cause is the site reset initiated during the install of KB971413. A site reset initiates a reinstall of all of the site components. If a Multicasting session is initiated too soon after the site reset, and if the site reset has not completed and if not all of the components have finished reinstalling, in particular the components associated with Multicasting, then the Multicasting session will fail.
The first and easiest resolution is to give the site reset some time to complete. However, if after waiting Multicasting is still not working, then some or all of the following actions may need to be taken:
The exact and detailed steps that need to be taken are listed below. Please note that we want to minimize server reboots in case the site reset is still being performed in the background:
If that does not resolve the issue:
And finally if the issue is still not resolved:
Frank Rojas | Senior Support Engineer