Comment 7 for bug 1690132

I received the same error with ooo HA - newton install. Using overcloud images from https://images.rdoproject.org/newton/delorean/consistent/stable/ which were updated 11-May-2017
Following this post https://bugzilla.redhat.com/show_bug.cgi?id=1441977#c2, I checked the image and found that the ssl socket is activated in /etc/httpd/conf.d/ssl.conf. Commenting this line out, and re-importing the image, allowed the overcloud install to complete. HTH