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Q. Does it means that my server can't download these files from Symantec Liveupdate server? If so, would there be any attempts from my server or Symantec Liveupdate servers to download these files?
--> As per the logs few updates were not available on Symantec liveupdate sever. There will be always attmpt from LUA server to download the latest definitions from Symantec liveupdate server as per the schedule.
LUA is still not updated?
How to Collect Troubleshooting Information from LiveUpdate Administrator 2.x
http://www.symantec.com/docs/TECH92654