something is wrong after 9.2 to 10.0

[SAITOU Toshihide]

I'm using FreeBSD as desktop and also using as nat gateway.
After update from 9.2 to 10.0, some network problem occurs
on this desktop machine's environment.

  - Sometimes email transmission failed with
    `stat=Deferred: 452', maybe when the size is large.

  - Firefox failed to post a form of web page on https.

  - Cadaver is no longer able to put file.

But if I delete the following rule, the problem don't occur.

  00050 352686 304039811 nat 123 ip4 from any to any via alc0

And the related rc.conf entry is here:

    firewall_enable="YES"
    firewall_type="open"
    firewall_quiet="NO"
    firewall_logging="YES"
    firewall_nat_enable="YES"
    firewall_nat_interface="alc0"

Is there any clue?

--
SAITOU Toshihide