I have Jenkins running behind Apache 2.2 reverse proxy in one box on a Windows Server 2008 R2. After upgrading Jenkins from 1.554.1 to 1.554.2. I got message "It appears that your reverse proxy set up is broken." in Manage Jenkins page. If I downgrade back to 1.554.1, problem is gone. I use SSL at front-end. However, Chrome Web developer Tool shows 1.554.2 Jenkins generated redirect pages in HTTP, not HTTPS.