I am encountering a strange problem.
Configuration - NW5.0+SP6a, BM3.5+SP3

The firewall works properly until suddenly it only accepts traffic from
it's own subnet. Anything outside of it's subnet cannot even reach the
authentication page.
If ipflt is unloaded, then connections from other IP range can be made.
Packet filtering rules were untouched.

Any ideas what is going on?