Hmmm....there has got to be a way to do this, at the very least on the server side. If this were a Tomcat server, I'd add the "ciphers" attribute to my HTTPS connector block (in my server.xml file) and have a comma-separated list of the ciphers that I wanted to be available for use.
I don't know how to do this in JBoss though, which is what the Hyperic server runs in.
Maybe there is a way to remove the low and medium ciphers from the JVM itself? Maybe via a Java runtime option? If the Hyperic Agent configuration doesn't support this via configuration, that may be the only way to do this.
Brian