Why RA Console shows some clients in red

[smartcard]

Some of my client PC in the RA console is showing red, see below screen cap.
http://www.quickfiles.net/img/NOD32%20RA%20Console.gif

I need to know the reason?

[anotherjack]

That's the "New" flag that's shown when a machine first reports back to the server. You can clear those by selecting the machine(s), then RIGHT clicking and selecting Reset "New" flag from the dropdown.