With NSSEngine set to off (I do have the admin server to use SSL), I get the following error:
 
# service dirsrv-admin start
Starting dirsrv-admin:
/usr/sbin/start-ds-admin: line 65:  2836 Segmentation fault      $SELINUX_CMD $HTTPD $OMIT_DEFLATE -k start -f /etc/dirsrv/admin-serv/httpd.conf "$@"
 
Eric.

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Do you have admin server configured to use SSL?  If so, try this
edit /etc/dirsrv/admin-serv/console.conf
change NSSEngine from "on" to "off"
start the admin server
Does it work now?