> On 13 Mar 2016, at 06:31, Yakov Feldman <yafeldman at gmail.com> wrote: > > I am trying to block the process that is listening upon the port 9110 on my > MacBook Pro in order to simulate network interruption. > Are you running FreeBSD or OS X? If you’re running OS X you’ll need to talk to Apple about this. Regards, Kristof