Hi fellow Bitcoiners,
just for the heads-up, my F-Secure 9.01 Deep Guard blocked bitcoin 0.3.21 for Windows. Reason was "Amount of network queries".
You can revert that false positive from GUI, but for average user it may be problematic.
Hopefully Deep Guard doesn't work by server given blocklist or there may be more wide spread firewall-problems arising.

=== Edit 08:37 ==

.. If you had this problem and solved it somehow elegantly, please let me know.
I reverted that false positive from Deep Guard deny list, but as usual with F-secure, it not enough. That false positive is automatically copied also to Application manager, which is one stubborn piece of sh.. software.
Even though I allowed in/out for bitcoin.exe from Application manager, it still doesn't allow inbound connections. Only option I come up with is to turn off application manager. Screen capture above in finnish may help.
(salli = allow)

http://www.heikkihakala.fi/temp/F-secure_bitcoin.png