MDT does not apply WSUS updates

A silly gotcha more than anything else…. after recently updating my WSUS server to use SSL (to allow publishing through the firewall) I noticed my clients that were deployed with MDT (Microsoft Deployment Toolkit) were not installing updates as part of the Task Sequence; indeed the message log at the end indicated that the updates could not be downloaded as there was no connectivity to the WSUS server.

Lone behold I had updated the path to be https:// (against http://) in the Group Policies that pointed the clients at the WSUS server but not in the Deployment Share properties in MDT. So let the lesson be learnt… be sure to make the URL change in MDT as well as in Group Policy.