Considering that mpirun launches the daemons successfully on nodes n204 and n202, it might be an issue with your connection to node n22. Can you verify the node is up and running (maybe via 'ping')? Also, make sure you can log into the node without being prompted for a password. For example, can you do:
ssh n22 hostname
from n204 (or any other node)?
Finally, make sure you don't have any security settings and/or firewalls preventing you to connect to the other nodes on your cluster.
Let me know what happens or if you have questions.