Root Cause: Application Manager (AM) 8 uses a legacy build with java 5. Java 1.8_121 + will block the client connection as AM 8 was built with an older version of java and older signature algorithm (MD5).
Update to a fix version listed below or a newer version if available.
Fix Status: Released
Applications Manager 9.0.0 - Available
Use an older version of Java pre-1.8_131 for the client side Java.