BM3.7 SP3; NW6 SP4

All proxy services have stopped. I set tcp ip debug and view the log, and
it appears that all proxy requests show something similar to:

Discard Incoming: cause(FILTERING), reason(5)

The tcp/ip debug screen is moving too fast for me to get more details.

1. Is there a log of activity that I can review?
2. Anybody run into a similar issue and have suggestions?