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 <balaji@mcs.anl.gov> 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 <balaji@mcs.anl.gov
<mailto:balaji@mcs.anl.gov>> 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
        <balaji@mcs.anl.gov <mailto:balaji@mcs.anl.gov>
        <mailto:balaji@mcs.anl.gov <mailto:balaji@mcs.anl.gov>>> 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>>


               -- 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