Why does installation of nscd fail with PREIN scriptlet failure on a machine using Centrify authentication?

Issue

• Installation of nscd package fails while running the following command with errors.

# yum install nscd

• The pertinent errors are

Error in PREIN scriptlet in rpm package nscd-2.12-1.107.el6_4.4.x86_64
groupadd: GID '28' already exists
useradd: group 'nscd' does not exist
error: %pre(nscd-2.12-1.107.el6_4.4.x86_64) scriptlet failed, exit status 6
error:   install: %pre scriptlet failed (2), skipping nscd-2.12-1.107.el6_4.4

• It fails because the directory service already knows a group with GID 28 i.e. Centrify

# adquery group|grep :28:
somegroup:x:28:member1,member2

• The RHEL5 nscd package doesn't care about its numberic GID, so the GID can be anything for that on Red Hat Enterprise Linux 5 as follows.

# groupadd -r nscd
# getent group nscd
nscd:x:489:
# yum install nscd

• And the package installs successfully after above steps.