Command status - wrong info of status and remote scan command was cancel itself

Dear Experts, 

For some reason the client doesn't have the latest virus definition. So, I'm trying to run remote command to update content directly to liveupdate server.

The status say 100% completed, but when check details, a few of them actually have liveupdate download failed.

And, I also found that active scan or full scan remote command was canceled itself at a few clients.

Any idea? I'm appreciate your advise.

regards,

Loh