When offloading, it should indeed be 80 [HTTP].
Perhaps you passed along an answer file that has:
from a prev. config attempt? or maybe you answered the SSL prompt with a Y by mistake?
Best re-run the config scripts and paste your answers here if there are still issues.
Regardless, curl -I -v https://portal.servcast.net needs to work, otherwise you'll have issues making API requests.
In addition, all Kaltura Apache nodes have the X-Me header set:
Header set X-Me "@KALTURA_VIRTUAL_HOST_NAME@"
but when I made the curl request to your LB [https://portal.servcast.net], I did not get this header, which makes me believe the actual Kaltura node is not even reached. Do you see the requests going through in the Apache access log? is the LB correctly routing to the Kaltura nodes?
Also, once the vhost configuration in /etc/httpd/conf.d/zzzkaltura.conf is fixed so that it listens on port 80 [which is what your LB expects] check whether you can reach the node directly and get the expected "start page".