<div dir="ltr">Yes thats what I did before and found out this to be exact:<br>"sudo: ufw: command not found"</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jun 28, 2013 at 11:50 AM, Pavan Balaji <span dir="ltr"><<a href="mailto:balaji@mcs.anl.gov" target="_blank">balaji@mcs.anl.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
IIRC, Ubuntu has a firewall setup by default.  Try this:<br>
<br>
% sudo ufw status<br>
<br>
 -- Pavan<div class="im"><br>
<br>
On 06/27/2013 09:48 PM, Syed. Jahanzeb Maqbool Hashmi wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
<br>
As I already read some discussion on the mpich thread and I came to know<br>
these questions before:<br>
<br></div>
  * *Can you ssh from "node01" to "node02"?*<div class="im"><br>
    Yes I have passwordless ssh from each node to other (and vice versa)<br></div>
  * *Make sure the firewalls are turned off on all machines.*<div class="im"><br>
    I am using Ubuntu Linaro, 12.04, and I have no firewall installed on<br>
    all the nodes.<br>
<br>
<br>
Any other workaround :(<br>
<br>
On Fri, Jun 28, 2013 at 11:43 AM, Pavan Balaji <<a href="mailto:balaji@mcs.anl.gov" target="_blank">balaji@mcs.anl.gov</a><br></div><div class="im">
<mailto:<a href="mailto:balaji@mcs.anl.gov" target="_blank">balaji@mcs.anl.gov</a>>> wrote:<br>
<br>
<br>
    On 06/27/2013 09:41 PM, Syed. Jahanzeb Maqbool Hashmi wrote:<br>
<br>
        MPID_nem_tcp_connpoll(1826): Communication error with rank 0:<br>
        Connection<br>
        refused<br>
<br>
<br>
    Sounds like a firewall problem.<br>
<br></div>
    <a href="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" target="_blank">http://wiki.mpich.org/mpich/__<u></u>index.php/Frequently_Asked___<u></u>Questions#Q:_My_MPI_program___<u></u>aborts_with_an_error_saying___<u></u>it_cannot_communicate_with___<u></u>other_processes</a><div class="im">
<br>
    <<a href="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" target="_blank">http://wiki.mpich.org/mpich/<u></u>index.php/Frequently_Asked_<u></u>Questions#Q:_My_MPI_program_<u></u>aborts_with_an_error_saying_<u></u>it_cannot_communicate_with_<u></u>other_processes</a>><br>

<br>
<br>
      -- Pavan<br>
<br>
    --<br>
    Pavan Balaji<br>
    <a href="http://www.mcs.anl.gov/~balaji" target="_blank">http://www.mcs.anl.gov/~balaji</a><br>
<br>
<br>
</div></blockquote><div class="HOEnZb"><div class="h5">
<br>
-- <br>
Pavan Balaji<br>
<a href="http://www.mcs.anl.gov/~balaji" target="_blank">http://www.mcs.anl.gov/~balaji</a><br>
</div></div></blockquote></div><br></div>