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Xulrunner crash when running with underprivileged user

I use SlimerJs as an headless browser on a server. Because the server have no xserver I used xvfb to run it. The command goes something like this: xvfb-run --server-args="-screen 0, 1024x768x24" ...
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selinux doesn't have httpd_can_network_connect as an option on ubuntu 15.04

I installed Ubuntu 15.04 and then installed selinux by doing sudo apt-get install selinux. I then did setsebool -P httpd_can_network_connect 0 and got a "Boolean httpd_can_network_connect is not ...
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packets information in tcpdump /capinfos

I'm testing the packet capture efficiency of a sniffer application (netsniff-ng) w.r.t a proprietary sniffer recorder. I had a linux system use tcpreplay to send 25 pcap files @ 100Mbps to both the ...