Changing ulimit open file descriptors

This is regarding changing the open file descriptors limit for regular cpanel account users, essentially, ulimit -n. I do have Shell Fork Bomb Protection turned on, but it does not seem to matter whether that is on or off, users (except for root and an account in wheel) are limited to 100 open file descriptors. I have made the changes that typically work as expected on CentOS: Added nofile lines to /etc/security/limits.conf * soft nofile 1024 * hard nofile 2048 Added session required pam_limits.so line to: /etc/pam.d/common-session /etc/pam.d/login /etc/pam.d/sshd In addition to modifying the ulimit changes (changing 100 to 1024) that enabling CPanel Shell Fork Bomb Protection makes to: /etc/bashrc /etc/profile /etc/profile.d/limits.sh /etc/profile.d/limits.csh This for the first three: #cPanel Added Limit Protections -- BEGIN #unlimit so we can run the whoami ulimit -n 4096 -u 14335 -m unlimited -d unlimited -s 8192 -c 1000000 -v unlimited 2>/dev/null LIMITUSER=$USER if [ -e "/usr/bin/whoami" ]; then LIMITUSER=`/usr/bin/whoami` fi if [ "$LIMITUSER" != "root" ]; then ulimit -n 1024 -u 35 -m 200000 -d 200000 -s 8192 -c 200000 -v unlimited 2>/dev/null else ulimit -n 4096 -u 14335 -m unlimited -d unlimited -s 8192 -c 1000000 -v unlimited 2>/dev/null fi #cPanel Added Limit Protections -- END And this for the last one: #cPanel Added Limit Protections -- BEGIN setenv LIMITUSER $USER if ( -e /usr/bin/whoami ) then setenv LIMITUSER `whoami` endif if ( "$LIMITUSER" != "root" ) then limit descriptors 1024 limit maxproc 35 limit memoryuse 200000 limit datasize 200000 limit stacksize 8192 limit coredumpsize 200000 else limit descriptors 4096 limit maxproc 14335 limit memoryuse unlimited limit datasize unlimited limit stacksize 8192 limit coredumpsize 1000000 endif #cPanel Added Limit Protections -- END Turning off Fork Bomb Protection removes all of those lines from the profile and shell rc scripts, but no changes are made to the ulimit values. I can edit the line set for root and change it to anything I want easily, but editing the line for non-root users has no effect. I will also note that for my oper user, which is in wheel, the ulimit -n is 1024, while it is 4096 for root. I've not seen where 1024 is specified explicitly for @wheel users (soft and hard are 1024, and changing the values in limits.conf doesn't seem to affect this user either). So, I'm a little lost on where to look next, short of setting up a CentOS install, duplicating it, installing CloudLinux and WHM on top of it and the diff'ing the file system. Ideas? Version info: CPANEL=release Server version: Apache/2.4.25 (Unix) Server built: Feb 18 2017 14:51:10 Cpanel::Easy::Apache v3.34.11 rev9999 +cloudlinux PHP 5.6.30 (cgi-fcgi) (built: Feb 18 2017 14:55:32) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies mysql Ver 14.14 Distrib 5.6.35, for Linux (x86_64) using EditLine wrapper