Netview NT polling problems

["Dearman, Richard" <rdearm1@UIC.EDU>]

I am monitoring about 2500 devices with Netview for up/down status
basically.  I have my polling interval set to every 3 minutes.  But when my
nodes go down Netview turns the status icon red but when they come back up
it takes longer than 3 minutes for the status to change back to green.
Sometimes it doesn't change back to green until a do a manual ping.  Is
there something I'm missing I though Netview polled every ip device every 3
minutes if that is how I have it set.

Thanks in advance
Brian