This isn't a bug in ufw, but rather something that needs to be tuned for your system. You might be interested in reading: http://security.stackexchange.com/questions/43205/nf-conntrack-table-full-dropping-packet
It could be argued that ufw should have cleared the table when disabled, but this would likely result in more problems for people who disable ufw and not seeing this problem. ** Changed in: ufw (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ufw in Ubuntu. https://bugs.launchpad.net/bugs/1377651 Title: ufw breaks sendto, even when disabled Status in ufw package in Ubuntu: Invalid Bug description: I enabled ufw to try it out, with the default settings. I disabled it, but I still get errors when trying to use sendto() to localhost: Errno::EPERM - Operation not permitted - sendto(2) /var/log/syslog is full of: Oct 5 14:42:14 host kernel: [9194390.533505] nf_conntrack: table full, dropping packet. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ufw/+bug/1377651/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp