I feel sorry to not able to provide more information and keeping the thread long. But still there is no ufw in my /usr/sbin. Actually, I am using an ARM development board (ORDROID-X2) which has ubuntu linaro image. I suppose that due to space limitation, this image may not include additional utility features like firewall but only the core functionality. On Fri, Jun 28, 2013 at 11:57 AM, Pavan Balaji <[email protected]> wrote:

% sudo /usr/sbin/ufw status

On 06/27/2013 09:52 PM, Syed. Jahanzeb Maqbool Hashmi wrote:

...

Yes thats what I did before and found out this to be exact: "sudo: ufw: command not found"

On Fri, Jun 28, 2013 at 11:50 AM, Pavan Balaji <[email protected] <mailto:[email protected]>> wrote:

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]> <mailto:[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_MPI_**program_____aborts_with_an_** error_saying_____it_cannot_**communicate_with_____other_**processes<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> <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<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>

...

<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<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> <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<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

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