I miscombobulated on the model number. My FB is x500 ( no 'e').
I believe this is/was the first generation 1u cased FB. It has the 1.2GHZ celeron cpu,FYI.
I would guess the mobo is significantly different than the board you were testing on.
The second gen 1u cased FB's were numbered x550e,x750e,etc,I believe the 'e' designates gigE nics?
In three-four days ill down your code and try it on this box and file a report,,,:)
FWIW. This simple box does handle two 3mb up/down connections with about 350 pc's and 1000 users,(possible)
Using squid,squidGuard,Lightsquid, load balance,failover.