Check the JMX port listed in /etc/cassandra/cassandra-env.sh 

If it's not default you can pass it to nodetool using the --jmx-port option. 

Cheers

-----------------
Aaron Morton
Freelance Cassandra Developer
New Zealand

@aaronmorton

On 31/01/2013, at 3:52 AM, Shahryar Sedghi <shsedghi@gmail.com> wrote:

I migrated my test environment from 1.2.0 to 1.2.1 (DataStax Community) and nodetool  can not communicate to 7199, even if it is listening. in one node I get  
Failed to connect to 'cassandra4:7199': Connection refused

in another node I get timeout.

Did I do anything wrong, when upgrading?

Thanks In advance

Shahryar
--
"Life is what happens while you are making other plans." ~ John Lennon