I've ZCM on W2K3R2 server. I've activate all discovery methods.
My discovery task is configured to search on Ip range X.X.X.1 to X.X.X.254.

When I launch this task, a line per IP @ is shown in the result board. So, I
can see my (almost) 20 PC but there is also 230 empty line which I do not
want to see.

Could you please tell me if this is normal ? Is there a method to
block/filter the display of this line.

On the second hand, after the first discovery, if I start again the task the
day after , zenworks creates another line for each PC. Sometimes I can
detect the OS sometimes not even for the Same PC.