Had NCF installed and working correctly on XPsp2, then installed McAfee
VirusScan 8.0i. It seems there is some sort of conflict between the
two. The "Network Activity" screen in NCF shows the "Allow/block
reason" to be "Defining the rule..." for traffic destined for 524 (NW
servers). After about 10 minutes with no change, I tried selecting
"Break Connection", and this resulted in a blue screen, nwfs.sys being
the culprit. Any ideas?