After upgrade or Installation of ITMS - Communication port in IIS have been changed to non-default port (from HTTP 80).
There is no visible errors, but you can notice that PXE does not provide machines with proper information needed to perform.
Default IIS ports have been changed or modified after the installation/upgrade to ITMS
HTTP port 80 has been changed to use port 8080
1) After changing the default ports in IIS, It may be required to change of following ports in registry HKLM\SOFTWARE\Altiris\AIM\Configuration\NsConfiguration
NsWebSitePort='Value' and NsWebSiteSSL='True/False"
2) Manually change the pectagent.ini's to include the new http port # in C:\Program Files\Altiris\Deployment\BDC\bootwiz\oem\DS\winpe\(x86 or x64)\Base\Program Files\Symantec\Deployment
3) Run the NS.Package Distribution Point Update & NS.Package Refresh from the Windows Task Scheduler.
At this point, the PXE Config file (SBSConfiguration.xml) should now be updated with the new port #.
4) Now Rebuild Preboots and this should propagate the new information down to the PXE servers.
Those Registry values are also used by Symantec Installation Manager