On Mon, Aug 3, 2009 at 1:41 PM, Ralph Castain <rhc@open-mpi.org> wrote:

The only thing that changes is the required connectivity. It sounds to me like you may have a firewall issue here, where cloud3 is blocking connectivity from cloud6, but cloud6 is allowing connectivity from cloud3.

Is there a firewall in operation, per chance?

Ralph

I have turned off all firewalls. This is the wireshark log of the traffic on one of the machines in the case that does not work: http://rpi.edu/~doriad/cloud3_cloud3+6.wsk

I see a bunch of red lines, where in any of the working tests cases I do not see any red lines. As you can tell from my analysis, I am an expert wireshark user (haha!) - can anyone interpret the problem from this file? Maybe I need to ask the wireshark mailing list for an analysis?

Thanks,

David