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

[Pavan Balaji]

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
>  > >
>  > > _______________________________________________
>  > > mpich-discuss mailing list mpich-discuss at mcs.anl.gov
>  > > To manage subscription options or unsubscribe:
>  > > https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>  >
>  > _______________________________________________
>  > mpich-discuss mailing list mpich-discuss at mcs.anl.gov
>  > To manage subscription options or unsubscribe:
>  > https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>
>
> _______________________________________________
> mpich-discuss mailing list     mpich-discuss at mcs.anl.gov
> To manage subscription options or unsubscribe:
> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss

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