unauthenticated source

version: 5.3 5330

application server is running on port 80 on an AWS EC2 instance
there is an elastic load balancer in front of application that is terminating SSL. Traffic between load balancer and app is http.
is works as expected in IE. when using chrome i get the secure url but when a user tries to login to enroll they get the below error

"Mixed Content: The page at ' https://URL.com/showLogin.cc' was loaded over HTTPS, but requested an insecure form action ' http://URL.com/authorization.do'. This request has been blocked; the content must be served over HTTPS

in the url bar a popup is received "the page is trying to load scripts from unauthenticated source"

we have already tried changing URL setting to site name on port 443 without success. any suggestions on how to resolve without enabling SSL on server. we would like to have certs in load balancer for managing.