"Too many open files" ERROR on IBM WebSphere Portal 7 startup (CentOS, RHEL, Fedora)

Temporary fix:
ulimit -n 65536

Permanent fix:
1. Edit /etc/security/limits.conf
2. Add the folowing lines:
  *    soft    nofile    65536
  *    hard    nofile    65536
3. Reboot

NOTE: It seems that 65536 might be a better value.
In some cases 10240 still gives 'Too many open files' error.

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