This message was posted on behalf of Intel Corporation
In order to use the Remote Console window of your managed server, Java Runtime Environment* (JRE*) Version 6 Update 22 or higher must be installed.
What browser do you use? Have you tried different ones?
Here in the RMM4 User Guide you will find useful information.
I run with Oracle Java 1.8.0_75 and IE11 as well as with OpenJDK 7u96 with IcedTea 2.6.4 on Ubuntu 14.04 with firefox. So the JRE version should be all satisfied yet i still got this NIO exception.