The "SSH to Host" button does not work. The "Login to remote host" feature on the left panel of IMU works fine, but when you click the "SSH to Host " button after selecting a host, you may get a message about "both secure and non-secure items" which requires you click "Yes", but then nothing happens.
There is no recent JRE installed on the server and the server does not have access to the Internet. The "SSH to Host" button starts a Java applet called MindTerm which is bundled with IMU. If IMU detects that there is no Java Virtual Machine installed, it will try and download one from the java.com website and install it.
Install the Java Runtime Environment JRE 1.6 or later.