Using the Intel® AMT add-on for Microsoft SMS 2003* on a Dell 755 returns this error:
+Current system UUID is different from last discovered UUID. Please rediscover the system.+
An Intel® AMT add-on for Microsoft SMS 3.0 hot fix 3 is available online at http://www.intel.com/software/sms-add-on.
This hot fix removes the continuity check between the SMBIOS and the Digest UUID, which was determined to be an unnecessary check.