if your working with Ubuntu in lab or test env, you may want to disable firewall…. two simple commands;
sudo ufw disable
sudo apt-get remove ufw
Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: ufw 0 upgraded, 0 newly installed, 1 to remove and 3 not upgraded. After this operation, 838 kB disk space will be freed. Do you want to continue? [Y/n] Y (Reading database ... 64052 files and directories currently installed.) Removing ufw (0.35-0ubuntu2) ... Skip stopping firewall: ufw (not enabled) Processing triggers for man-db (2.7.5-1) ...