Begun seeing XP PC's unable to upgrade WinCE

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

I have begun seeing more XP PC's that are unable to upgrade our WinCE 5
images using the UDP BOOTME method. Some machines will see the BOOTME,
others will not. Those that see BOOTME will start sending the image and fail
right away.
The upgrading mechanism involves UDP messages, the same method that Platform
Builder uses.
Is anyone aware of changes to XP or changes to NIC hardware that may, for
security reasons, block UDP traffic? Even if firewalls etc. are disabled?
This has been working for a number of years and now it appears something has
broken it.
The machines that are not working do NOT have Platform Builder on them, but
a download tool that works fine on most machines.

.

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