Thanks jsalisbury. Ill try on another kernel now. The steps to reproduce on xenial:
sudo su - apt install --yes apache2 haproxy echo " listen test bind *:8776 bind :::8776 " > /etc/haproxy/haproxy.cfg echo " Listen 8776 <VirtualHost *:8776> DocumentRoot /var/www/html </VirtualHost> " > /etc/apache2/sites-enabled/01-test.conf systemctl restart haproxy systemctl restart apache2 netstat -peanut | grep 8776 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1720378 Title: Two processes can bind to the same port To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1720378/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs