On Mon, Feb 15, 2010 at 1:13 PM, Shahan Khan <contact@shahan.me> wrote:

db1b:~# nodeprobe -host db1a ring

Error connecting to remote JMX agent!

java.rmi.ConnectException: Connection refused to host:; nested exception is: 

This seems to indicate that db1a resolves as on db1b, when it actually needs to resolve to the 192.168 address.  Try passing the ip address as the host and it should work.