IIRC, Ubuntu has a firewall setup by default. Try this: % sudo ufw status -- Pavan On 06/27/2013 09:48 PM, Syed. Jahanzeb Maqbool Hashmi wrote:

As I already read some discussion on the mpich thread and I came to know these questions before:

* *Can you ssh from "node01" to "node02"?* Yes I have passwordless ssh from each node to other (and vice versa) * *Make sure the firewalls are turned off on all machines.* I am using Ubuntu Linaro, 12.04, and I have no firewall installed on all the nodes.

Any other workaround :(

On Fri, Jun 28, 2013 at 11:43 AM, Pavan Balaji <[email protected] <mailto:[email protected]>> wrote:

On 06/27/2013 09:41 PM, Syed. Jahanzeb Maqbool Hashmi wrote:

MPID_nem_tcp_connpoll(1826): Communication error with rank 0: Connection refused

Sounds like a firewall problem.

http://wiki.mpich.org/mpich/__index.php/Frequently_Asked___Questions#Q:_My_M... <http://wiki.mpich.org/mpich/index.php/Frequently_Asked_Questions#Q:_My_MPI_program_aborts_with_an_error_saying_it_cannot_communicate_with_other_processes>

-- Pavan

-- Pavan Balaji http://www.mcs.anl.gov/~balaji

-- Pavan Balaji http://www.mcs.anl.gov/~balaji