[mpich-discuss] MPID_nem_tcp_connpoll(1826): Communication error with rank 0: Connection refused

[Pavan Balaji]

[Please keep mpich-discuss cc'ed. I tend to ignore MPI question emails 
sent directly to me.]

Ubuntu does install a firewall automatically, AFAIK. You can check:

% sudo ufw status

  -- Pavan

On 10/22/2011 04:38 PM, Miguel Angel Fernández wrote:
> Unles Ubuntu installs a firewall automaticly, I don't understand what
> can be the problem.
>
> Anyway, I'm going to install the WireShark (Ethereal) on Ubuntu. Maybe
> this clarify the problem.
>
> Thanks
> Miguel Angel
>
>  > Date: Sat, 22 Oct 2011 16:20:43 -0500
>  > From: balaji at mcs.anl.gov
>  > To: mpich-discuss at mcs.anl.gov
>  > CC: mafga74 at hotmail.com
>  > Subject: Re: [mpich-discuss] MPID_nem_tcp_connpoll(1826):
> Communication error with rank 0: Connection refused
>  >
>  >
>  > It picks whichever port it can find. It's not fixed.
>  >
>  > This does look like a firewall problem. Most firewalls, keep the ssh
>  > port (22) open, so being able to do an ssh doesn't mean there's no
> firewall.
>  >
>  > On 10/22/2011 03:46 PM, Miguel Angel Fernández wrote:
>  > > Hi Rajeev
>  > >
>  > > Thanks for your response but there is no any firewall among them.
>  > >
>  > > mpi0 is Ubuntu
>  > > mpi1 to mpi4 are Debian (minimun distribution without GUI)
>  > >
>  > > I am doing the conection among them with ssh and it is well configured
>  > > and properly working, I tested it.
>  > > I am thinking,...are you using a socket conettion to comunicate the
>  > > diferent processes? This could be the problem in the Ubuntu one (mpi0).
>  > > If this is the case, can you tell me the exactly socket you are using?
>  > >
>  > > Thanks
>  > > Miguel Angel
>  > >
>  > >
>  > > > From: thakur at mcs.anl.gov
>  > > > Date: Sat, 22 Oct 2011 15:30:26 -0500
>  > > > To: mpich-discuss at mcs.anl.gov
>  > > > Subject: Re: [mpich-discuss] MPID_nem_tcp_connpoll(1826):
>  > > Communication error with rank 0: Connection refused
>  > > >
>  > > > Make sure the 5 machines can communicate with each other, i.e., there
>  > > is no firewall preventing connections.
>  > > >
>  > > > Rajeev
>  > > >
>  > > > On Oct 22, 2011, at 12:36 PM, Miguel Angel Fernández wrote:
>  > > >
>  > > > > Hello everybody
>  > > > >
>  > > > > I'm trying to fix a problem that appear when I execute one of the
>  > > mpich2 program examples.
>  > > > > As you can see, if I execute a normal command there are no
>  > > problems. The cluster work properly.
>  > > > >
>  > > > > mpi at mpi0:~$ mpiexec -f ./mpich2-install/machinefile -n 5 hostname
>  > > > > mpi0
>  > > > > mpi2
>  > > > > mpi3
>  > > > > mpi1
>  > > > > mpi4
>  > > > > mpi at mpi0:~$
>  > > > >
>  > > > > but when I try to execute the program, the results are something
>  > > like this
>  > > > >
>  > > > > mpi at mpi0:~$ mpiexec -f ./mpich2-install/machinefile -n 5
>  > > /home/mpi/mpich2-install/workspace/Prueba/Debug/Prueba
>  > > > > Hello MPI World the original.
>  > > > > Hello MPI World the original.
>  > > > > Hello MPI World the original.
>  > > > > Hello MPI World the original.
>  > > > > Hello MPI World the original.
>  > > > > From process 0: Num processes: 5
>  > > > > Fatal error in MPI_Send: Other MPI error, error stack:
>  > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfcbe268, count=26,
>  > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
>  > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
>  > > Connection refused
>  > > > > Fatal error in MPI_Send: Other MPI error, error stack:
>  > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfb32ca8, count=26,
>  > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
>  > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
>  > > Connection refused
>  > > > > Fatal error in MPI_Send: Other MPI error, error stack:
>  > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfa49e98, count=26,
>  > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
>  > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
>  > > Connection refused
>  > > > > Fatal error in MPI_Send: Other MPI error, error stack:
>  > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfa57538, count=26,
>  > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
>  > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
>  > > Connection refused
>  > > > >
>  > > > > Do you have any idea what can be the problem?
>  > > > >
>  > > > > Thank you in advance
>  > > > > Miguel Angel
>  > > > >
>  > > > > _______________________________________________
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>  > > >
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>  > >
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>  >
>  > --
>  > Pavan Balaji
>  > http://www.mcs.anl.gov/~balaji

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