Blackboard ssl-offload using x-forwarded-proto unsuccessful

We've got the same issue with loop redirection of http 8081 in BB Learn. I'm not sure if it's a BB bug or not but BB support tell me to check my LB settings. I try to stop redirect in tomcat server.xml file, but it dosen't change anything :( Steven, if you follow this thread, i would appreciate more details on you solution. Thanks