#summary for situation described by issue60 #labels Featured,Phase-Support
= Introduction =
security patch, helpful side keeper
= Details =
==Use iptables for network blocking== use this line
iptables -A OUTPUT -m owner --uid-owner judge -j DROP
to block any network out going ip package from judge_client(not include PING) REMEMBER to save it using http://www.cyberciti.biz/faq/how-do-i-save-iptables-rules-or-settings/
==Update all code to at least r1371== for livecd users try
sudo update-hustoj
==Disable Unused Language== edit /var/www/JudgeOnline/include/db_info.inc.php
$OJ_LANGMASK=1008; //for C/CPP/Pascal/Java only