Weird BLOCKS logged by UFW networkubuntuufw by Bazyli Brzóska | August 15th, 2013 | Code & Security | 0 comments http://ubuntuforums.org/showthread.php?t=2138691 It’s to do with FIN and RST flags on the packets. Source: http://ubuntuforums.org/showthread.php?t=2138691