packet cannot pass bridge sometimes ....

[ProAce]

( untrust ) --- ( em0 , bridge0 , em1 ) --- ( trust )

os version: 9.0-p3

I disable firewall , just run bridge function, and I bind a ip on em0.

Sometimes , I cannot connect to server ( in trust zone ) from untrust.
Then, I ping some ip from the server ( in trust ) to a host ( in untrust ).
Suddenly, I connect to the server ( in trust zone ) successfully from
untrust at this time.

Why？How can I solve the problem？



Regards,