Siege: descriptor table full sock.c:119: Too many open files
Solution 1:
To solve this problem for myself, I had to adjust the OS "ulimit" setting:
ulimit -a -- Check current setting
ulimit -n 10000 -- Edit setting value
Source: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=595527
Solution 2:
Just increase the maximum number of files that can be open by the same user within the same session accordingly.
Source: http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/