I use Azureus bittorrent client, and when CPF is active it blocks all incoming connections from other hosts, and the NAT/Firewall test fails for all tested ports.
The log shows some rejected incoming connections with the error “Blocked by Protocol Analysis: ACK FIN RST is an invalid TCP flag combination.” However, running the Azureus NAT test doesn’t cause anything to show up in the log even though the test fails.
This happens even if I make Azureus a completely trusted application.
If I set CPF to Allow All, everything starts working properly again.
Any idea what to do about this?