Microsoft has updated the following KB article:
FIX: Task sequence to install an operating system doesn’t run when you use custom port settings in System Center Configuration Manager 2012 SP1
Summary:
When you use custom port settings in Microsoft System Center 2012 Configuration Manager Service Pack 1 (SP1), the task sequence does not run. For example, when you configure the site to use port numbers other than port 80 or port 433 as the default ports, the deployment fails because the operating system image cannot be downloaded. Additionally, the following error message is logged in the Smsts.log file:
“Error downloading file from http://siteserver.sccm.local:80/SMS_DP_SMSPKG$/CMnnnnnn/sccm?/install.wim to C:\_SMSTaskSequence\Packages\CMnnnnnn\install.wim ApplyOperatingSystem 1996 (0x07CC)
For full details see:
http://support.microsoft.com/kb/2838585