Sorry about the other post, this one may not come in correctly either...

In anycase, I will explain this after the main issue...

I have the following differences in my /etc/pam.d/su file:

Fedora22:
#%PAM-1.0
auth            sufficient      pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth           sufficient      pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth           required        pam_wheel.so use_uid
auth            substack        system-auth
auth            include         postlogin
account         sufficient      pam_succeed_if.so uid = 0 use_uid quiet
account         include         system-auth
password        include         system-auth
session         include         system-auth
session         include         postlogin
session         optional        pam_xauth.so

CentOS6.6:

#%PAM-1.0
auth            sufficient      pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth           sufficient      pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth           required        pam_wheel.so use_uid
auth            include        system-auth
account         sufficient      pam_succeed_if.so uid = 0 use_uid quiet
account         include         system-auth
password        include         system-auth
session         include         system-auth
session         optional        pam_xauth.so

When I try to mimic the settings for Fedora 22 in CentOS6.6 to test if this is the cause I become unable to open sockets.

[ root@localhost ~ ]# su user
could not open session

So while this may be the issue, I have to believe that it is not the sole issue and there must be another cause.
I hadn't tested the su-l file for differences yet, but it is primarily for login-shells... which admittedly my CenOS6.6 connection is through a login-shell as it is through ssh, whereas the Fedora22 is through a non-login-shell from the GUI.

Luckily this CentOS6.6 system is also has a GUI so I will try to replicate from a non-login-shell and get back to you with more information.

Now for my lack of understanding of the mailing list. 

On the computer, I don't understand how to reply without having to copy information from multiple sources.  The entire list comes in a single post (very difficult to read) and replying to one means replying to all. 

Additionally, operating on my phone doesn't even permit me to view the posts, and I must manually go to the archives to read any of the new additions.

Is there a better way of viewing this list without having to copy paste titles and contents?